Deep One

Creature 1

Medium
amphibious
humanoid

Perception: +7; darkvision, wavesense (imprecise) 30 feet
Languages: Aklo, Common
Skills: Athletics +6, Intimidation +5, Religion +6, Stealth +4, Survival +4; Str +3, Dex +1, Con +4, Int +2, Wis +1, Cha +1

Pressurized A deep one is immune to damage and other negative effects from changes in water pressure.

AC: 16; Fort +9, Ref +4, Will +8
HP: 24; Resistances cold 2, piercing 3

Endless A deep one doesn't age and is immune to spells and other effects that inflict magical aging. Unless killed, a deep one lives forever.

Speed: 25 feet, swim 40 feet

Melee ◆ jaws +7, Damage 1d6+3 piercing

Melee ◆ claw +7 (agile), Damage 1d4+3 piercing

Occult Innate Spells DC 14, attack +6; 1st hydraulic push; Cantrips (1st) daze

Fervent Frenzy ◆◆◆ The deep one makes two claw Strikes and one jaws Strike in any order. If the target creature is currently frightened by a deep one's Share Devotion ability, it's Off-Guard against these attacks. The deep one becomes Clumsy 1 until the start of their next turn.

Share Devotion ◆◆ (concentrate, emotion, fear, mental) The deep one fills their enemies' minds with terrible hallucinations of the Outer Gods. All enemy creatures within a 30-foot emanation must attempt a DC 17 Will save; regardless of the result, a creature is temporarily immune to Share Devotion for 24 hours.

Critical Success The creature is unaffected.

Success The creature is Frightened 1.

Failure The creature is Frightened 2.

Critical Failure As failure, plus Dazzled for as long as it's frightened.

Source: Pathfinder Monster Core 2

Running this fight? Add the deep one to the initiative tracker: type its name and the AC, hit points and Perception for initiative fill in, and the book button shows this stat block mid-fight.