A creature that touches the primal oozer or hits it with a melee attack while within 5 feet of it takes 3 (1d6) acid damage.

The primal oozer’s barbed tentacles inject the ooze plague disease into a creature if the creature fails its saving throw after being bitten twice in a row by the oozer. Until the disease is cured, the infected creature’s skin slowly becomes more ooze-like, and its hp maximum decreases by 5 (2d4) for every 24 hours that elapse. This reduction lasts until the disease is cured. The creature dies if the disease reduces its hp maximum to 0. A humanoid slain by this disease rises 24 hours later as an ochre jelly. The jelly isn’t under the primal oozer’s control, but it views the primal oozer as an ally.

The primal oozer has advantage on attack rolls against a creature if at least one of the primal oozer’s allies is within 5 feet of the creature and the ally isn’t incapacitated.

The primal oozer has advantage on ability checks and saving throws made to escape a grapple.