Sorvuth-Ka

Slumbering Armageddon — Sorvuth-ka's slumber accelerates erosion and weathering, timed to always break at the point of maximum harm via rockslides, sinkholes, treefalls, and other collapses.
Spawn of Rovagug can sleep for centuries in a regenerative hibernation. While slumbering, a Spawn doesn't need to eat, drink, or even breathe, and its resistances double in value. It can't be located by detection, revelation, or scrying effects, and for any saving throw, it uses the outcome one degree of success better than the result. With no outlet while the Spawn slumbers, its massive destructive energies turn outward and infect its surroundings, causing natural disasters of a type matching the Spawn to occur more frequently and with greater severity in a 1-mile emanation from the Spawn's resting place, increasing in radius by roughly a mile every decade the Spawn slumbers.

Absolute Regeneration — Sorvuth-ka's regeneration can be deactivated by slaying it with a weapon made from the bones of Chemnosit, Kothogaz, Ulunat, Volnagur, and Xotani.
This functions as regeneration, though it requires very specific actions to be deactivated. A Spawn of Rovagug's regeneration is powerful enough to revive it even if slain by a death effect. If the Spawn fails a save against an effect that would kill it instantly, it rises from death 3 rounds later with 1 Hit Point. A Spawn can still be banished, imprisoned, or transported away as a means to save a region or kept in a state of dying by an effect that deals constant damage.

Adaptive Defenses — When injured, Sorvuth-ka's body adapts to ensure that the triggering insult can't harm it again. Immediately after it takes damage, it becomes immune to that type of damage. It can become immune to three different types of damage in this way, with newer immunities replacing older ones.

Bleed Destruction —

Frightful Presence (aura, emotion, fear, mental) — 300 feet. DC 45 Will
A creature that first enters the area must attempt a Will save.

Regardless of the result of the saving throw, the creature is temporarily immune to this monster's Frightful Presence for 1 minute.

Critical Success The creature is unaffected by the presence.

Success The creature is Frightened 1.

Failure The creature is Frightened 2.

Critical Failure The creature is Frightened 4.

Reactive — Sorvuth-ka gains 3 reactions each round. It can still use only one reaction per trigger.

Reactive Strike —

Amber Strikes — Crystallize Sorvuth-ka's blood flows around the target's limbs before hardening. The creature must succeed at a DC 48 Reflex save or become Immobilized and Off-Guard until it Escapes. If the creature was flying, it falls.

Inject Sorvuth-ka's blood invades the target through its wounds. The target must succeed at a DC 48 Fortitude save or become Sickened 2 (Sickened 3 on a critical failure). As long as the target is sickened, Sorvuth-ka's blood will attempt to counteract any effect that could restore Hit Points to the target (counteract rank 10, counteract modifier +38).

Splash Sorvuth-ka's blood splashes violently, dazzling the target until the end of its next turn and creating a blood pool in a square adjacent to the target.

Detonate Blood —

Rough Rampage —

Improved Grab —