Armor Class
16
Elder Oblex
Huge Ooze · Lawful Evil
Hit Points
115 (10d12 + 50)
Speed
Walk 20 ft.
CR
10
Traits
Amorphous
The oblex can move through a space as narrow as 1 inch wide without squeezing.
Aversion to Fire
If the oblex takes Fire damage, it has disadvantage on attack rolls and ability checks until the end of its next turn.
FireSulfurous Impersonation
As a bonus action, the oblex can extrude a piece of itself that assumes the appearance of one Medium or smaller creature whose memories it has stolen. This simulacrum appears, feels, and sounds exactly like the creature it impersonates, though it smells faintly of sulfur. The oblex can impersonate different creatures, each one tethered to its body by a strand of slime that can extend up to 120 feet away. For all practical purposes, the simulacrum is the oblex, meaning the oblex occupies its space and the simulacrum's space simultaneously. The slimy tether is immune to damage, but it is severed if there is no opening at least 1 inch wide between the oblex's main body and the simulacrum. The simulacrum disappears if the tether is severed.
Actions
Multiattack
The elder oblex makes two pseudopod attacks and uses Eat Memories.
Pseudopod
Melee Weapon Attack +7 to hit, reach 10 ft., one target. 17 () Bludgeoning damage plus 7 () Psychic damage.
Bludgeoning
PsychicEat Memories
The oblex targets one creature it can see within 5 feet of it. The target must succeed on a DC 18 Wisdom saving throw or take 44 () Psychic damage and become memory drained until it finishes a short or long rest or until it benefits from the or spell. Constructs, oozes, plants, and undead succeed on the save automatically.
While memory drained, the target must roll a and subtract the number rolled from any ability check or attack roll it makes. Each time the target is memory drained beyond the first, the die size increases by one: the becomes a , the becomes a , and so on until the die becomes a , at which point the target becomes for 1 hour. The effect then ends.
When an oblex causes a target to become memory drained, the oblex learns all the languages the target knows and gains all its proficiencies, except any saving throw proficiencies.
While memory drained, the target must roll a and subtract the number rolled from any ability check or attack roll it makes. Each time the target is memory drained beyond the first, the die size increases by one: the becomes a , the becomes a , and so on until the die becomes a , at which point the target becomes for 1 hour. The effect then ends.
When an oblex causes a target to become memory drained, the oblex learns all the languages the target knows and gains all its proficiencies, except any saving throw proficiencies.