Death slaad

Death slaadi were very powerful evil slaad shapechangers and spellcasters.

Description
Death slaads were visually indistinguishable from gray slaads.

Personality
Despite still having all memories of their former green and gray slaad selves, the behavior of the death slaadi starkly contrasted their previous attitudes, specifically in regards to their interests. No longer concerned with increasing their magical powers, death slaadi were sadists focused on bringing death and pain to those around them, the most powerful of which undergoing rogue training in order to later become full-fledged assassins.

Abilities
Death slaadi, by some mysterious means, obtained many of their powers by controlling the Spawning Stone in Limbo. They were creatures of destruction and decay, stunning and rotting those they struck with their natural weapons  and draining the life energy from those they pierced with their fangs. They possessed the same potential powers as their former selves in addition to more death related spell-like abilities such as cloudkill, astral projection, phantasmal killer, finger of death and circle of death.

Like in their previous forms, they could polymorph into their original humanoid hosts, reportedly while retaining their incredible strength. They could also summon red, blue, green and gray slaads, although not other death slaads.

Combat
Though they seldom wore armor and were lethally proficient with their claws and fangs, death slaads preferred to wield magical weaponry, often blades such as swords of sharpness.

Society
They commanded armies of lesser red and blue slaadi to invade other planes and used the survivors as hosts to spawn new slaadi.

Ecology
Death slaadi emerged as the result of a gray slaad having devoured the corpse of a dead death slaad. The death slaadi were infused with energy from the Negative Energy plane.