still don't get what breach do in minecraft is

worth adding that it's only good against things that actually wear armour. on most mobs it does basically nothing, so for general grinding density or smite does more. breach shines in pvp against someone in netherite.

mace enchant. it makes the target's armor count for less when you hit them, so it's for fighting stuff that's heavily armored. goes up to level IV. can't stack it with density or smite, so you're choosing between big fall damage and armor piercing. the books mostly come out of trial chamber vaults.