Obeleric

False Appearance. While motionless indistinguishable from normal boulder.

Ricochet Charge (Defensive Form Only). If it moves 15 ft.+ straight to target and then hits target with Boulder Bash attack on same turn target has disadvantage on save vs. being knocked prone. If target is prone obeleric can move up to 15 ft. straight to 2nd target with o provoking opportunity attacks from 1st target and make one Boulder Bash attack vs. 2nd target as a bonus action if 2nd target is within its reach.

Multiattack. Two Tentacle Slam or Acid Spit attacks.

Boulder Bash (Defensive Form Only). Melee Weapon Attack: +5 to hit, 5 ft., one target, 14 (2d10+3) bludgeoning damage and target knocked prone (DC 13 Str not prone).

Tentacle Slam. Melee Weapon Attack: +5 to hit, 5 ft., one target, 8 (2d4+3) bludgeoning damage + 3 (1d6) acid.

Spit Acid. Ranged Weapon Attack: +4 to hit 20/60' one target 9 (2d6+2) acid. A creature hit by this takes additional 3 (1d6) acid at the start of its next turn.

Defensive Roll. Can roll itself into a boulder-like defensive form or back into its tentacled true form. While in defensive form it has resistance to B/P/S damage from nonmagical attacks can't make Tentacle Slam or Spit Acid attacks and can't use Reflux.

Reflux. When the obeleric takes bludgeoning it can vomit acid at one creature within 5 ft. of it. That creature must make DC 13 Dex save or take 3 (1d6) acid.