Guardian Vex

Guardian vexes don’t spawn naturally and can only be summoned by a vexing chant, this item can be found in the woodland mansions almost anywhere, and when summoned they’ll wield a stone sword and will attack the same way as a normal vex, the mob is also immune to the fang spell, but unlike normal ones they won’t be able to phase through walls, the mob has a time limit and will stay around for about 10-15 minutes. The vexing chant will lose durability each summon and can be enchanted with unbreaking and mending.