Big

Big is a joke effect that increases the size of entities, added in 23w13a_or_b.

The size of entities (both visual size and its hitbox) are multiplied by level+1. Mob drops are also multiplied: there are (level+1)3 rolls performed on a mob under this effect. This means, for example, that an evoker with Big I always drops 8 totems of undying, calculated from (1+1)3, as there is a 100% chance to drop the totem on each roll. This evoker also drops anywhere from 0 to 8 emeralds, most likely 4, as there is a 50% chance to drop an emerald on each roll.

Issues relating to "Big" are not maintained on the bug tracker because it is an April Fools' joke, and is therefore not in the newest stable version or snapshot. Issues reported there are closed as "Invalid".