Standard rogue type monster except when killed its brain pops like a firework and a scuttling intellect devourer emerges. I described the head popping similar to the affect in the Kingsman. Made my players both laugh and puke a little.
Medium humanoid (kasath), chaotic evil
Armor Class 18 (psychic defense, plus buckler)
Hit Points 84 (13d8 + 26)
Speed 30 ft.
STR 13 (+1) DEX 18 (+4) CON 15 (+2)
INT 16 (+3) WIS 17 (+3) CHA 12 (+1)
Saving Throws Str +4, Dex +7, lnt +6, Wis +6
Skills Arcana +6, Insight +6, Perception +6
Senses passive Perception 16 Languages –
Challenge 6 (2,300 XP)
Psionics. While inhabited by an intellect devourer the kasath gains some psionic abilities. The kasath’s spell casting ability is Wisdom (spell save DC 14, +6 to hit with spell attacks). It can innately cast the following spells, requiring no components:
- At will: mage hand (the hand is invisible)
- 3/day each: feather fall, jump, see invisibility
- 1/day each: phantasmal killer
Psychic Defense. While an intellect devourer inhabits the kasatha, its AC includes its Wisdom modifier.
Sneak Attack (1/Turn). The kasatha deals an extra 7 (2d6) damage when it hit s a target with a weapon attack and has advantage on the attack roll , or when the target is within 5 feet of an ally of the spy that isn’t incapacitated and the kasatha doesn’t have disadvantage on the attack roll.
Multiattack. The kasath makes two short sword strikes.
Short Sword Strike. Melee Weapon Attack: +7 to hit, reach 5 ft. , one target.
Hit: 11 (2d6 + 4) piercing damage plus 13 (3d8) psychic damage. This is a magic weapon attack.
When an inhabited Kasatha is killed the controlling intellect devourer emerges but is stunned for one round. Additionally a kasatha gains shield as a reaction ability while inhabited: An invisible barrier of magical force appears and protects YOU. Until the start of your next turn, you have a +5 bonus to AC, including against the triggering attack, and you take no damage from magic missile.
Kasathas have gray-skinned humanoid bodies, four lanky arms, and spade-shaped alien faces.