Ysondkhelir

Constant Spells — A constant spell affects the monster without the monster needing to cast it, and its duration is unlimited. If a constant spell gets counteracted, the monster can reactivate it by spending the normal spellcasting actions the spell requires.

Planar Fast Healing — A denizen of Leng maintains a connection to Leng at all times, and when away from Leng, they have fast healing 5. They lose this ability on Leng or in areas where planar connections do not function. If killed, their body dissolves into nothingness in 1d4 rounds, leaving behind their equipment. A slain denizen reforms in Leng; they can be permanently killed only when their planar fast healing doesn't function.

A monster with this ability regains the given number of Hit Points each round at the beginning of its turn.

No Breath — Denizens of Leng don't need to breathe.

Debilitating Bite (curse, occult) — A creature that takes damage from a denizen's bite must succeed at a DC 27 Fortitude save or become Clumsy 1. Each time a target fails an additional save against this ability, the condition value increases by 1 (to a maximum of Clumsy 4). This condition value decreases by 1 every 24 hours.

Leng Ruby (occult) — Many denizens of Leng carry strange rubies mined from quarries in Leng. As long as a creature holds a Leng ruby that it willingly accepted as a gift or payment from a denizen of Leng, any denizen of Leng can target that creature with Outcast's Curse, Phantom Pain, or Mind Reading at a range of 1 mile, and the bearer uses an outcome one degree of success worse than the result of its saving throw against Outcast's Curse .