Warden can easily be killed by going in a 2 block tall hole.

𝗪𝗛𝗔𝗧 𝗪𝗔𝗦 𝗦𝗨𝗣𝗣𝗢𝗦𝗘𝗗 𝗧𝗢 𝗛𝗔𝗣𝗣𝗘𝗡:

The warden would have some way to attack.

 

𝗪𝗛𝗔𝗧 𝗔𝗖𝗧𝗨𝗔𝗟𝗟𝗬 𝗛𝗔𝗣𝗣𝗘𝗡𝗘𝗗:

The warden can't attack and spins in circles.

 

𝗛𝗢𝗪 𝗧𝗢 𝗥𝗘𝗖𝗥𝗘𝗔𝗧𝗘:

Spawn and warden and dig 2 blocks down with all sides being filled and watch.