A sedacthy speaking Thalassic can be understood by any animal that has a swim Speed or the amphibious or aquatic trait. By spending a week regularly interacting with such an animal, the sedacthy can make it permanently helpful.

Sea Speech

Wavesense (Imprecise) 30 feet

Troop Defenses

Troop Movement

Frequency once per round<hr/>Effect The warband launches a frenzy of attacks against each enemy in a 5-foot emanation with a DC 26 Basic Reflex save. The damage depends on the number of actions. For each enemy damaged by this attack, the damage of the attack increases by 1d4 piercing for all targets (up to a maximum of 3d4 additional damage).
1 1d6+3 piercing damage plus 1d4 persistent bleed damage
2 2d6+6 piercing damage plus 1d6 persistent bleed damage
3 3d6+9 piercing damage plus 1d8 persistent bleed damage

Frenzied Feast

The warband unleashes a chorus of terrifying battle cries. Each enemy in a 30-foot emanation must attempt a DC 29 Will save. Regardless of the results, creatures are temporarily immune for 1 minute.<hr/>Critical Success The creature is unaffected.
Success The creature is <a href="/condition/frightened">Frightened 1</a>.
Failure The creature is <a href="/condition/frightened">Frightened 2</a>.
Critical Failure The creature is <a href="/condition/immobilized">Immobilized</a> for 1 round and <a href="/condition/frightened">Frightened 3</a>.

War Shriek

Sedacthy Warband - amphibious, humanoid, sedacthy, troop

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

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

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

Frequency once per round<hr />Effect The warband launches a frenzy of attacks against each enemy in a @Template[type:emanation|distance:5] with a @Check[reflex|dc:26|basic] save. The damage depends on the number of actions. For each enemy damaged by this attack, the damage of the attack increases by 1d4 piercing for all targets (up to a maximum of 3d4 additional damage).
1 @Damage[(1d6+3)[piercing]|options:area-damage] damage plus @Damage[1d4[persistent,bleed]|options:area-damage] damage
2 @Damage[(2d6+6)[piercing]|options:area-damage] damage plus @Damage[1d6[persistent,bleed]|options:area-damage] damage
3 @Damage[(3d6+9)[piercing]|options:area-damage] damage plus @Damage[1d8[persistent,bleed]|options:area-damage] damage

The warband unleashes a chorus of terrifying battle cries. Each enemy in a @Template[type:emanation|distance:30] must attempt a @Check[will|dc:29] save. Regardless of the results, creatures are temporarily immune for 1 minute.<hr />Critical Success The creature is unaffected.
Success The creature is @UUID[Compendium.pf2e.conditionitems.Item.Frightened]{Frightened 1}.
Failure The creature is @UUID[Compendium.pf2e.conditionitems.Item.Frightened]{Frightened 2}.
Critical Failure The creature is @UUID[Compendium.pf2e.conditionitems.Item.Immobilized] for 1 round and @UUID[Compendium.pf2e.conditionitems.Item.Frightened]{Frightened 3}.