Amorphous. The oblex can move through a space as narrow as 1 inch wide without squeezing.
Aversion to Silver. If the oblex takes damage from silvered weapons, it has disadvantage on attack rolls and ability checks until the end of its next turn.
Innate Spellcasting. The oblex’s innate spellcasting ability is Intelligence (spell save DC 18). It can innately cast the following spells, requiring no material components:
At will: charm person (as 5th-level spell), detect thoughts, hold person
3/day each: confusion, counterspell (as 5th-level spell), dimension door, dominate person, fear, hallucinatory terrain, hold monster, hypnotic pattern, telekinesis
1/day each: feeblemind, plane shift
Sulfurous 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 2d10 + 1 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.
Multiattack. The elder oblex makes three pseudopod attacks and uses Eat Memories.
Pseudopod. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 17 (4d6 + 3) bludgeoning damage plus 7 (2d6) psychic damage.
Eat 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 (8d10) psychic damage and become memory drained until it finishes a short or long rest or until it benefits from the greater restoration or heal spell. Constructs, oozes, plants, and undead succeed on the save automatically.
While memory drained, the target must roll a d4 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 d4 becomes a d6, the d6 becomes a d8, and so on until the die becomes a d20, at which point the target becomes unconscious 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.
Manifest. The oblex manifests up to a total of 10CR of creatures from Appendix B of Volo's Guide to Monsters. It can maintain up to 20 CR of creatures at one time. These manifestations have their own hit points as defined by their stat blocks and roll initiative independently., but have vulnerability to fir and cold damages.
Unlike the simulacra produced by Sulfurous Impersonation, these manifestations are unconnected to the oblex. If a manifestation is the target of a spell that would remove a charmed effect, and fails that save, the manifestation gains the stunned status until reabsorbed by the oblex. A manifestation can be absorbed by the oblex as a free action if it is adjacent to or occupying the same space as the oblex.
Memory Blast (Recharge 5–6). The oblex magically emits psychic energy in a 10-foot radius from itself and all manifestations. Each creature in that area must succeed on a DC 18 Wisdom saving throw or take 22 (4d8 + 4) psychic damage and be stunned for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.
The oblex can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The oblex regains spent legendary actions at the start of its turn.
Manage Manifestation. Any manifestation currently in initiative takes one action.
Eat Memories. The oblex uses its Eat Memories ability.
Manifest. The oblex uses its Manifest ability.
Pseudopod. The oblex makes a Pseudopod attack
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