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.

Tremorsense (Imprecise) 90 feet

Trigger A creature within the monster&#x27;s reach uses a manipulate action or a move action, makes a ranged attack, or leaves a square during a move action it&#x27;s using.
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Effect The monster attempts a melee Strike against the triggering creature. If the attack is a critical hit and the trigger was a manipulate action, the monster disrupts that action. This Strike doesn&#x27;t count toward the monster&#x27;s multiple attack penalty, and its multiple attack penalty doesn&#x27;t apply to this Strike.

Reactive Strike

The ankhrav makes a mandibles Strike; if the Strike hits, the target&#x27;s armor takes the damage and the acid damage bypasses the armor&#x27;s Hardness.

Armor-Rending Bite

The hive mother unleashes a pheromone that causes all other sciardavs within a 100-foot emanation to become <a href="/condition/quickened">Quickened</a> until the start of the hive mother&#x27;s next turn, and they can use the extra action only for Burrow, Stride, or Strike actions. The hive mother can&#x27;t unleash the pheromone again for 1d4 rounds.

Frenzy Pheromone

The hive mother spews acid in a 60-foot cone, dealing 12d6 acid and 2d6 acid persistent damage (DC 31 Basic Reflex save). It can&#x27;t Spray Acid again for 1d4 rounds.

Spray Acid

@Localize[PF2E.NPC.Abilities.Glossary.Tremorsense]

@Localize[PF2E.NPC.Abilities.Glossary.ReactiveStrike]

The ankhrav makes a mandibles Strike; if the Strike hits, the target's armor takes the damage and the acid damage bypasses the armor's Hardness.

The hive mother unleashes a pheromone that causes all other sciardavs within a @Template[type:emanation|distance:100] to become @UUID[Compendium.pf2e.conditionitems.Item.Quickened] until the start of the hive mother's next turn, and they can use the extra action only for Burrow, Stride, or Strike actions. The hive mother can't unleash the pheromone again for [[/gmr 1d4 #Recharge unleash the pheromone]]{1d4 rounds}.

The hive mother spews acid in a @Template[type:cone|distance:60], dealing @Damage[12d6[acid],2d6[acid,persistent]|options:area-damage] damage (@Check[reflex|dc:31|basic|options:area-effect] save). It can't Spray Acid again for [[/gmr 1d4 #Recharge Spray Acid]]{1d4 rounds}.

Sciardav Hive Mother