New deep dark mob and mechanic

I think that the new Warden should be invincible to everything but a new mob ive been thinking about.

what if you added  new mob that had the same colour pallet as the warden and it was in the same biome as the warden. I have 2 different ideas for the mob

Idea 1: The mob is like a giant lizard or spider (same colour pallet as the warden) which crawls across the roof and is also blind. when it hears something under it, it will drop onto it in an attempt to kill it. it does with anything apart from the warden. if it has dropped down, it will first attack the entity it dropped on to, if any. and then it will climb up the nearest wall; back to the ceiling of the cave. If you time it perfectly and make it drop on the warden, the warden will die and drop a "traveler's soul."

Idea 2: it is a tentacle (same colour pallet as the warden) hidden in the walls, if it sees something go bye, it will shoot out and grab it, damaging it. (you can only survive the grab with full netherite.) it will not intentionally grab the warden, however, if you time it perfectly it will grab the warden, kill it and drop a "traveler's soul."

Traveler's soul: A traveler's soul would be like the soul of a villager that was consumed by the warden. I think you should be able to find brown cloaks in loot chests and villages and if you put them together in an anvil, a villager will spawn with good trades, the same as when you revive one from a zombie.