Evoker Totem Usage

Give the Evoker a chance to use it's Totem of Undying. But make it a really small percentage (increasing as the difficulty increases). When used, it cannot be dropped, rendering raid farms less effective. You could also make this a gamerule (Ex: /gamerule evokerusetotem false) You might be thinking to only put this feature in harder difficulties, I think it should go in all the difficulties (besides peaceful for obvious reasons) so that those who are new to the game gain a better understanding of how the totem works, and to clarify that it must be held in either your hand or offhand, have the evoker hold the totem, similar to how a witch holds a potion.