Bog Mummy Amalgamation

Tremorsense allows a monster to feel the vibrations through a solid surface caused by movement. It is an imprecise sense with a limited range (listed in the ability). Tremorsense functions only if the monster is on the same surface as the subject, and only if the subject is moving along (or burrowing through) the surface.

30 feet. A creature that begins its turn within the area feels as if its lungs are filling with silt and must succeed at a DC 25 fortitude save or be unable to speak or breathe. The creature can still hold its breath and can attempt a new saving throw at the end of its turn. A creature that succeeds is temporarily immune to breath of silt for 24 hours.

Requirements Initiative has not yet been rolled

The bog mummy amalgamation notices the creature automatically and Burrows before rolling initiative.

A creature with void healing draws health from void energy rather than vitality energy. It is damaged by vitality damage and is not healed by vitality healing effects. It does not take void damage, and it is healed by void effects that heal undead.

This affliction can't be reduced below stage 1, nor can the damage from it be healed, until it's successfully treated with Cleanse Affliction or a similar effect; the affliction can then be removed as normal for a disease. A creature killed by bog rot melts into a noxious sludge and can't be resurrected except by a 7th-rank Resurrect ritual or similar magic Saving Throw DC 21 fortitude Stage 1 carrier with no ill effect (1 minute) Stage 2 3d6 void damage and Clumsy 1 (1 day).

The amalgamation makes two fist Strikes against two different targets within its reach. Its multiple attack penalty doesn't increase until after both attacks.