Volnagur

Slumbering Armageddon — Volnagur's slumber increases the rate of wildlife attacks, swarms of vermin and pests, and violent crime.
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 — Volnagur's regeneration can be deactivated if a choir of no less than 12 exquisitely skilled and inspired individuals sings a song of beginnings and hope over its corpse for 1 year and 1 day without pause or flaw.
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.

Alien Harmonics (auditory, aura, sonic) — 60 feet.

Volnagur constantly emits a cacophony that drowns out sound and thought while reinforcing Volnagur's song. Creatures that enter the aura must attempt a DC 43 Fortitude save or Volnagur's song becomes all they can hear for as long as they remain within the aura, making creatures Deafened against all sources other than Volnagur.

On a critical failure, the effect is permanent, and the cacophony rings in the target's ears regardless of range. The aura also attempts to counteract any auditory effect, any effect that would provide resistance or immunity to auditory or sonic effects, or any effect that would create silence (counteract rank 10, counteract modifier +33).

Frightful Presence (aura, emotion, fear, mental) — 300 feet. DC 42 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.

Intercepting Eyes —

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

Reactive Strike —

Endsong (curse, mental, sonic) — Subtle vibrations laced under Volnagur's attacks confuse its targets and fill their minds with the desire to destroy. A creature damaged by one of Volnagur's Strikes must attempt a DC 45 Will save.

Critical Success The target is unaffected and is temporarily immune for 24 hours or until it takes damage from Scream of the End.

Success The target is unaffected.

Failure The target is Confused for 1d4 rounds. It never attempts to attack Volnagur or another creature affected by endsong.

Critical Failure As failure, but the target is confused for 1 hour. While confused, its Strikes resonate with Volnagur's song, dealing an additional 1d6 sonic damage and forcing the target to save against endsong.

Gaze Upon — Volnagur makes an eye beam Strike against every creature in a 120-foot cone. These attacks count toward Volnagur's multiple attack penalty, but the multiple attack penalty doesn't increase until after Volnagur makes all its attacks. It can't use Gaze Upon again for 1d4 rounds, but until the start of Volnagur's next turn, it can use Intercepting Eyes as a free action.

Scream of the End (sonic) —

Grab —