Ion Slime 2014
CR 5 ooze
Small ooze, unaligned
Move through space 1ft.+ wide with o squeezing.
Whenever subjected to lightning it takes no damage and instead regains hp equal to lightning dealt. Its Supercharge then recharges. If it takes cold while supercharged it must roll a d6. On a 1 or 2 it loses the supercharged state.
Doesn’t require sleep.
Difficult surfaces even ceilings no ability check.
Bonus Actions
Dash or Dodge action.
Gathers ambient electricity to supercharge itself for 3 rounds. While supercharged slime gains +2 bonus to its AC and it gains an additional action on each of its turns. At end of the third round if the slime hasn't used the Discharge action it suffers feedback taking 18 (4d8) force. Its supercharged state then ends.
Source: Tome of Beasts 3 (Kobold Press) · License: OPEN GAME LICENSE Version 1.0a details