Aox, the Remeberer

Amphibious. Aox can breath on air and underwater.

Aquatic Brute. A melee weapon deals one extra die of its damage when Aox hits with it, or two extra die while Aox is fully submerged underwater. (included in the attack).

Poisonous Skin. At the start of each of Aox's turns, he deals 3 (1d6) poison damage to any creature grappling him.

Slippery Scales. Aox has advantage on Dexterity checks to escape a grapple and, when trying to escape a grapple by use of a Strength check, he may add his Dexterity modifier to the roll as well as his Strength modifier.

Multiattack. Skathix makes one bite or tail attack and two feathered staff attacks. He can replace any one attack with his water belch.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) bludgeoning damage plus 3 (1d6) acid or force damage (Aox's choice).

Tail. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 5 (1d4 + 3) bludgeoning damage.

Feathered Staff (+1 Quarterstaff). Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 8 (2d4 + 3) bludgeoning damage + 3 (1d6) force damage + 1 acid, poison, necrotic, or radiant damage (Aox's choice).

Water Belch. Ranged Weapon Attack: +5 to hit, range 25/80 ft., one target. Hit: 8 (2d6 + 1) acid damage.

Weight of Aeons (Recharge 6). Aox chooses up to 5 hostile creatures that he can see within 60 feet of him. Each of those creatures must succeed on a DC 17 Intelligence saving throw, taking 7 (2d6) force damage and suffer the following effects for 1 minute:

• Disadvantage on and -3 to hit and to damage to attack rolls.
• Have speed decreased by 5 feet.
• Have initiative number decreased by 4.

Innate Spellcasting. Aox casts one of the following spells without needing material components, using Wisdom as his spellcasting ability (spell save DC 17, +6 to hit with spell attacks):

At will: animal friendship, burden of time, cure wounds, create or destroy water (can be cast as a bonus action)

5/day: detect magic, fog cloud, accelerate plant growth, accelerate item, temporal disjunction, greater restoration

3/day: temporal push, time slip 

Spellcasting. Aox casts one of the following spells, using Wisdom as his spellcasting ability (spell save DC 18, +7 to hit with spell attacks):

Cantrips (at will): acid splash, shillelagh, guidance, mold earth, druidcraft

1st level (4 slots): comprehend languages, ensnaring strike, detect poison and disease, protection from evil and good, alter arrow's fortune

2nd level (3 slots): aid, animal messenger, protection from poison, wither and bloom, augury

3rd level (3 slots): call lightning, haste, dispel magic, clearstone

4th level (2 slots): death ward, vitriolic sphere, control water

5th level (2 slots): commune with nature, hallow

6th level (1 slot): find the path, time loop

7th level (1 slot): mirage arcane