Tomb of Annihilation

Deal X damage to all creatures until the number
of creatures equals 0, and create a X/X black
Zombie creature token with menace.
If L is a linear differential operator with constant coefficients and F is a sufficiently differentiable
function such that, L(F(x))= 0, then L is said to be
an Annihilator of the function.
— Dennis G. Zill