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Bipedal Orca
Humanoid, Chaotic Good
Armor Class Armor Stat or 14                   (natural armor)
Hit Points Max Possible: 168 | (12d12 + 24)
Speed 30 ft., Swim 60 ft. 
STR
20 (+5)
DEX
18 (+4)
CON
14 (+2)
INT
16 (+3)
WIS
16 (+3)
CHA
16 (+3)
Saving Throws INT +6, CHA +4
Skills Stealth +5, Perception +5
Damage Resistances Cold, Fire, Lightning
Damage Immunities Poison
Condition Immunities Charmed, Exhaustion, Frightened, Paralyzed, Poisoned, Prone
Senses Blindsight 150 ft., Passive Perception 14
Languages Common, Orca
Proficiency Bonus +4
Traits

Hold Breath: 30 minutes.

Magic Resistance. Brain in a Jar has advantage on saving throws against spells and other magical effects.

Actions

Bite: +8, reach 10 ft. Hit (2d8 +5) Piercing damage.

Weapon: +8, reach 10 ft. Hit (2d12 +5) weapon dependent damage.

Bonus Actions

Pack Tactics. Whenever Bipedal Orca attacks target adjacent to another Bipedal Orca it gets an additional Bite attack.