[MC-81414] Realm hacked

My friends Realm is being hacked.

It all started when we were playing on my friends Realm, and one of us died, via /kill. We asked one another: "Who did that?!". We could not say who had.
Then I died. Then another. Then another.
We have no idea what had happened. The /killing kept going on and on.
It has been happening since February 2015. Then my other friend`s screen started going crazy, placing TNT all over spawn. We were in a Google Hangout call, and he said his player`s movement was involuntary. He wasn`t doing anything, not even touching his mouse. We set up a command block clock killing all primed TNT. This happened one more time, and we began to suspect this was all a big prank. But it wasn`t.
We all forgot the incident, and a week passed by. It got worse. All of a sudden, a huge lag spike affected our MineCraft browsers. Someone had done a command: "/tp @e (PlayerName)". This happened rapidly and constantly. It has been happening to this day. Then one day, June 12, 2015, I logged on to the realm. Our spawn was ruined. It had looked as if it had been hit by an earthquake. Thousands of blocks had been broken at random while we were away. The worst had still not come. I looked at our spawn. Someone had built pixel art of male genitalia, with a stream of urine coming out. I quickly logged off, horrified.
The name of the Realm is "MythCraft", and the owner is MindlessReader.
I think this has to do with the security issues lately.

PLEASE HELP!
-19Elements (My username)

---- Minecraft Crash Report ----
// This doesn't make any sense!

Time: 6/15/15 9:20 AM
Description: Manually triggered debug crash

java.lang.Throwable
	at ave.s(SourceFile:1587)
	at ave.av(SourceFile:888)
	at ave.a(SourceFile:325)
	at net.minecraft.client.main.Main.main(SourceFile:124)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

-- Head --
Stacktrace:
	at bdb.a(SourceFile:309)

-- Affected level --
Details:
	Level name: MpServer
	All players: 2 total; [bew['19Elements'/2429, l='MpServer', x=200.78, y=75.93, z=-10.04], bex['xXMr_BedrockXx'/29, l='MpServer', x=199.25, y=76.50, z=-9.15]]
	Chunk stats: MultiplayerChunkCache: 361, 361
	Level seed: 0
	Level generator: ID 00 - default, ver 1. Features enabled: false
	Level generator options: 
	Level spawn location: 245.00,39.00,-82.00 - World: (245,39,-82), Chunk: (at 5,2,14 in 15,-6; contains blocks 240,0,-96 to 255,255,-81), Region: (0,-1; contains chunks 0,-32 to 31,-1, blocks 0,0,-512 to 511,255,-1)
	Level time: 31478680 game time, 17530 day time
	Level dimension: 0
	Level storage version: 0x00000 - Unknown?
	Level weather: Rain time: 0 (now: false), thunder time: 0 (now: false)
	Level game mode: Game mode: spectator (ID 3). Hardcore: false. Cheats: false
	Forced entities: 141 total; [bew['19Elements'/2429, l='MpServer', x=200.78, y=75.93, z=-10.04], vn['Creeper'/9216, l='MpServer', x=199.69, y=65.00, z=0.69], uz['item.item.string'/11267, l='MpServer', x=197.22, y=52.00, z=-8.63], wc['Spider'/8710, l='MpServer', x=188.59, y=68.00, z=-13.28], wc['Spider'/8712, l='MpServer', x=195.16, y=73.00, z=-9.19], we['Zombie'/9224, l='MpServer', x=208.13, y=67.00, z=0.63], we['Zombie'/9227, l='MpServer', x=214.94, y=69.00, z=-6.22], tk['Bat'/11020, l='MpServer', x=229.47, y=37.44, z=32.44], tk['Bat'/11280, l='MpServer', x=180.06, y=20.06, z=22.66], um['Display'/21, l='MpServer', x=200.75, y=74.00, z=-10.06], um['Armor Stand'/22, l='MpServer', x=200.75, y=74.00, z=-10.06], tk['Bat'/11288, l='MpServer', x=245.78, y=38.91, z=-24.59], we['Zombie'/5657, l='MpServer', x=196.59, y=69.00, z=-15.72], vn['Creeper'/5914, l='MpServer', x=273.06, y=64.00, z=28.47], tk['Bat'/11291, l='MpServer', x=245.75, y=42.00, z=-21.63], vn['Creeper'/9244, l='MpServer', x=180.09, y=67.00, z=-11.72], bex['xXMr_BedrockXx'/29, l='MpServer', x=199.25, y=76.50, z=-9.15], tk['Bat'/11293, l='MpServer', x=245.75, y=36.06, z=-20.19], wc['Spider'/9246, l='MpServer', x=181.47, y=68.00, z=-12.84], wc['Spider'/4130, l='MpServer', x=202.81, y=72.00, z=-14.54], we['Zombie'/9255, l='MpServer', x=206.84, y=73.00, z=-5.81], vn['Creeper'/4393, l='MpServer', x=215.94, y=68.50, z=-39.72], tk['Bat'/10538, l='MpServer', x=243.38, y=35.91, z=28.22], tk['Bat'/10539, l='MpServer', x=245.34, y=35.91, z=25.88], vn['Creeper'/5421, l='MpServer', x=192.56, y=73.00, z=-25.03], wd['Witch'/9261, l='MpServer', x=231.53, y=67.00, z=-8.66], wc['Spider'/8243, l='MpServer', x=175.57, y=71.00, z=-35.75], vn['Creeper'/5428, l='MpServer', x=203.47, y=71.00, z=-21.66], vn['Creeper'/8502, l='MpServer', x=223.97, y=69.00, z=-26.66], tv['Sheep'/5174, l='MpServer', x=250.53, y=71.00, z=-9.00], vn['Creeper'/7734, l='MpServer', x=186.88, y=66.00, z=-2.16], tt['Pig'/5176, l='MpServer', x=180.91, y=65.00, z=3.88], vn['Creeper'/8504, l='MpServer', x=220.16, y=69.00, z=-19.13], tt['Pig'/5178, l='MpServer', x=190.19, y=68.00, z=-9.66], tv['Sheep'/5179, l='MpServer', x=189.34, y=68.00, z=-8.47], we['Zombie'/9020, l='MpServer', x=220.78, y=63.00, z=7.22], we['Zombie'/9021, l='MpServer', x=213.63, y=69.00, z=-1.16], tk['Bat'/11325, l='MpServer', x=175.44, y=19.94, z=13.41], tt['Pig'/5184, l='MpServer', x=193.53, y=68.00, z=-15.34], vw['Zombie Pigman'/11072, l='MpServer', x=200.59, y=74.00, z=-8.47], tn['Chicken'/5185, l='MpServer', x=201.44, y=69.00, z=-35.31], wc['Spider'/9028, l='MpServer', x=223.28, y=62.47, z=34.50], vn['Creeper'/8005, l='MpServer', x=177.94, y=65.00, z=2.38], vw['Zombie Pigman'/11078, l='MpServer', x=209.13, y=67.00, z=0.53], we['Zombie'/9287, l='MpServer', x=206.84, y=65.00, z=6.63], vn['Creeper'/8264, l='MpServer', x=222.56, y=68.00, z=-13.69], we['Zombie'/9288, l='MpServer', x=207.94, y=69.00, z=-1.47], vn['Creeper'/8521, l='MpServer', x=211.50, y=69.00, z=-11.69], vn['Creeper'/9033, l='MpServer', x=218.56, y=67.00, z=-0.84], vn['Creeper'/8523, l='MpServer', x=176.41, y=67.00, z=-11.09], we['Zombie'/9295, l='MpServer', x=220.45, y=68.00, z=-7.27], wc['Spider'/5712, l='MpServer', x=162.78, y=74.00, z=5.75], we['Zombie'/9296, l='MpServer', x=200.25, y=69.00, z=-4.50], uz['item.item.rottenFlesh'/10325, l='MpServer', x=197.72, y=52.00, z=-8.13], uz['item.item.dyePowder.black'/10581, l='MpServer', x=199.25, y=52.00, z=-10.38], vn['Creeper'/8534, l='MpServer', x=205.22, y=69.00, z=-32.16], uz['item.item.dyePowder.black'/10582, l='MpServer', x=198.88, y=52.00, z=-8.78], vn['Creeper'/8535, l='MpServer', x=203.67, y=72.88, z=-13.35], vn['Creeper'/8280, l='MpServer', x=234.28, y=68.00, z=-15.72], we['Zombie'/9304, l='MpServer', x=197.56, y=69.00, z=-15.69], uz['item.item.rottenFlesh'/10840, l='MpServer', x=197.69, y=66.00, z=2.16], we['Zombie'/9305, l='MpServer', x=206.03, y=71.00, z=-2.34], wc['Spider'/8283, l='MpServer', x=219.72, y=68.00, z=-3.58], wc['Spider'/8541, l='MpServer', x=176.72, y=67.00, z=-9.81], wc['Spider'/8031, l='MpServer', x=193.84, y=69.00, z=-15.84], uz['item.item.dyePowder.black'/10597, l='MpServer', x=203.94, y=73.00, z=-12.22], um['Display'/9323, l='MpServer', x=200.75, y=74.00, z=-10.06], vo['Enderman'/7788, l='MpServer', x=189.75, y=64.00, z=2.53], um['Armor Stand'/9324, l='MpServer', x=200.75, y=74.00, z=-10.06], uz['item.item.dyePowder.black'/10605, l='MpServer', x=200.91, y=73.00, z=-12.78], tx['Squid'/11117, l='MpServer', x=201.13, y=56.00, z=47.03], uz['item.item.dyePowder.black'/10606, l='MpServer', x=200.06, y=74.00, z=-11.25], tx['Squid'/11118, l='MpServer', x=201.44, y=55.94, z=38.00], tx['Squid'/11119, l='MpServer', x=205.19, y=53.41, z=40.81], uz['item.item.dyePowder.black'/10608, l='MpServer', x=200.75, y=74.00, z=-10.06], tx['Squid'/11120, l='MpServer', x=202.59, y=55.91, z=33.31], uz['item.item.leather'/10353, l='MpServer', x=198.09, y=52.00, z=-9.75], tx['Squid'/11121, l='MpServer', x=229.28, y=61.53, z=20.69], uz['item.item.leather'/10354, l='MpServer', x=198.16, y=52.00, z=-10.88], tx['Squid'/11122, l='MpServer', x=226.81, y=59.50, z=10.53], uz['item.item.beefRaw'/10356, l='MpServer', x=198.97, y=52.00, z=-10.53], uz['item.item.beefRaw'/10357, l='MpServer', x=198.06, y=52.00, z=-10.38], vn['Creeper'/6518, l='MpServer', x=213.28, y=70.00, z=-24.38], vo['Enderman'/7288, l='MpServer', x=199.28, y=65.00, z=-0.28], we['Zombie'/9339, l='MpServer', x=222.13, y=63.00, z=4.47], we['Zombie'/9340, l='MpServer', x=210.22, y=66.00, z=4.41], we['Zombie'/9341, l='MpServer', x=210.41, y=68.00, z=-0.31], vn['Creeper'/9351, l='MpServer', x=218.28, y=63.00, z=14.38], vn['Creeper'/9356, l='MpServer', x=213.72, y=65.00, z=4.88], tk['Bat'/10894, l='MpServer', x=168.53, y=29.10, z=-47.00], tk['Bat'/10895, l='MpServer', x=165.84, y=28.24, z=-43.11], vn['Creeper'/8594, l='MpServer', x=190.34, y=68.00, z=-14.03], vn['Creeper'/8595, l='MpServer', x=214.84, y=65.00, z=3.78], we['Zombie'/8852, l='MpServer', x=218.47, y=68.00, z=-3.19], vn['Creeper'/8598, l='MpServer', x=222.28, y=68.00, z=-12.75], wu['Fireball'/8854, l='MpServer', x=200.75, y=75.91, z=-10.06], we['Zombie'/1179, l='MpServer', x=216.75, y=68.00, z=-40.81], vo['Enderman'/6818, l='MpServer', x=205.69, y=71.00, z=-23.16], we['Zombie'/8612, l='MpServer', x=203.78, y=71.50, z=-24.00], we['Zombie'/4263, l='MpServer', x=221.47, y=69.00, z=-37.19], tk['Bat'/10665, l='MpServer', x=172.32, y=54.48, z=-86.11], wa['Skeleton'/10154, l='MpServer', x=215.50, y=16.00, z=37.50], vn['Creeper'/6827, l='MpServer', x=187.22, y=68.00, z=-14.63], vn['Creeper'/10155, l='MpServer', x=213.50, y=16.00, z=36.50], vn['Creeper'/6829, l='MpServer', x=228.16, y=62.41, z=17.06], vn['Creeper'/6830, l='MpServer', x=186.47, y=68.00, z=-15.69], vn['Creeper'/8626, l='MpServer', x=205.69, y=71.00, z=-16.31], vn['Creeper'/6835, l='MpServer', x=179.34, y=69.41, z=-14.38], we['Zombie'/7091, l='MpServer', x=213.44, y=69.00, z=-8.34], vo['Enderman'/10163, l='MpServer', x=132.50, y=67.00, z=-69.50], vn['Creeper'/6837, l='MpServer', x=183.22, y=68.00, z=-14.03], vn['Creeper'/8630, l='MpServer', x=251.28, y=63.00, z=20.28], vn['Creeper'/8631, l='MpServer', x=187.80, y=73.00, z=-27.31], vn['Creeper'/9911, l='MpServer', x=221.00, y=63.00, z=15.25], vn['Creeper'/6840, l='MpServer', x=189.25, y=71.00, z=-18.72], vn['Creeper'/9912, l='MpServer', x=215.94, y=63.00, z=10.69], wa['Skeleton'/10189, l='MpServer', x=232.50, y=64.00, z=-5.50], um['Display'/10190, l='MpServer', x=267.50, y=75.97, z=-22.50], um['Armor Stand'/10191, l='MpServer', x=267.50, y=76.97, z=-22.50], wc['Spider'/9172, l='MpServer', x=178.41, y=67.00, z=-11.31], wa['Skeleton'/10201, l='MpServer', x=152.50, y=70.00, z=-33.50], wa['Skeleton'/10202, l='MpServer', x=152.50, y=70.00, z=-36.50], wa['Skeleton'/10203, l='MpServer', x=149.50, y=70.00, z=-33.50], wc['Spider'/7903, l='MpServer', x=203.72, y=72.13, z=-18.31], we['Zombie'/8160, l='MpServer', x=213.09, y=69.50, z=-22.94], tk['Bat'/10976, l='MpServer', x=247.52, y=41.08, z=-15.57], vn['Creeper'/10209, l='MpServer', x=229.50, y=38.00, z=19.50], tk['Bat'/10977, l='MpServer', x=247.17, y=48.07, z=-19.55], tk['Bat'/10470, l='MpServer', x=148.79, y=14.11, z=3.32], uz['item.tile.cloth.white'/10222, l='MpServer', x=153.59, y=69.00, z=-49.56], uz['item.item.muttonRaw'/10224, l='MpServer', x=154.16, y=69.00, z=-49.97], uz['item.tile.cloth.white'/10225, l='MpServer', x=215.63, y=66.00, z=1.56], uz['item.item.muttonRaw'/10226, l='MpServer', x=215.84, y=66.00, z=1.03], we['Zombie'/8691, l='MpServer', x=192.16, y=68.00, z=-13.56], we['Zombie'/8692, l='MpServer', x=187.47, y=68.00, z=-15.47], uz['item.tile.cloth.white'/10228, l='MpServer', x=221.22, y=63.00, z=7.31], uz['item.item.muttonRaw'/10229, l='MpServer', x=220.28, y=63.00, z=7.22], tk['Bat'/10486, l='MpServer', x=276.17, y=24.09, z=-33.98], uz['item.item.porkchopRaw'/10232, l='MpServer', x=170.09, y=64.00, z=17.59], vn['Creeper'/8699, l='MpServer', x=190.44, y=71.00, z=-18.72], tk['Bat'/10751, l='MpServer', x=129.00, y=20.10, z=-62.22]]
	Retry entities: 0 total; []
	Server brand: vanilla
	Server type: Integrated singleplayer server
Stacktrace:
	at bdb.a(SourceFile:309)
	at ave.b(SourceFile:2293)
	at ave.a(SourceFile:334)
	at net.minecraft.client.main.Main.main(SourceFile:124)

-- System Details --
Details:
	Minecraft Version: 1.8.7
	Operating System: Windows 8.1 (amd64) version 6.3
	CPU: 4x AMD A8-6410 APU with AMD Radeon R5 Graphics 
	Java Version: 1.8.0_25, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 180208856 bytes (171 MB) / 321183744 bytes (306 MB) up to 1060372480 bytes (1011 MB)
	JVM Flags: 6 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode -XX:-UseAdaptiveSizePolicy -Xmn128M
	IntCache: cache: 0, tcache: 0, allocated: 13, tallocated: 95
	Launched Version: 1.8.7
	LWJGL: 2.9.4
	OpenGL: AMD Radeon(TM) R5 Graphics GL version 4.3.12804 Compatibility Profile Context 13.352.1004.1007, ATI Technologies Inc.
	GL Caps: Using GL 1.3 multitexturing.
Using GL 1.3 texture combiners.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Shaders are available because OpenGL 2.1 is supported.
VBOs are available because OpenGL 1.5 is supported.

	Using VBOs: No
	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: [faithful32pack1.8.zip]
	Current Language: English (US)
	Profiler Position: N/A (disabled)