Dig a 2-block-deep pit and lure the Warden into it
Build a 3×3 or larger hole with walls too high to climb out
Use boats to temporarily hold the Warden in place
Use minecarts on rails to trap the Warden in a confined area
Surround the trap with wool to reduce vibration detection
Place water around the trap to slow movement
Use a piston door or closing mechanism to seal the Warden inside
Dig a tunnel and lead the Warden into a dead-end chamber
Build the trap in the Deep Dark away from other mobs
Keep distance and avoid making vibrations while setting the trap