Lotus Golem

Large Construct unaligned

STR	DEX	CON	INT	WIS	CHA
14 (+2)	19 (+4)	14 (+2)	6 (-2)	12 (+1)	4 (-3)

Saving Throws: Str +6, Dex +8
Skills: athletics +6, perception +9
Damage Immunities: cold, fire, poison, psychic
Damage Resistances: bludgeoning, piercing, and slashing from nonmagical attacks that aren't adamantine
Condition Immunities: charmed, exhaustion, frightened, paralyzed, petrified, poisoned
Senses: darkvision 60 ft., passive Perception 19
Languages: understands the languages of its creator but can't speak

Arcane Pool: The lotus golem absorbs energy from nearby spellcasting. Most lotus golems hold 1 charge point at any given time but can hold up to 4. As a bonus action while casting a spell within 5 feet of the lotus golem, the golem's controller can expend the golem's charge points to cast the spell without expending a spell slot. To do so, the controller must expend a number of charge points equal to the level of the spell.
Immutable Form: The golem is immune to any spell or effect that would alter its form.
Magic Resistance: The golem has advantage on saving throws against spells and other magical effects.
Magic Weapons: The golem's weapon attacks are magical.
Water Walker: The golem can move across the surface of water as if it were harmless, solid ground. This trait works like the water walk spell.

Multiattack: The lotus golem makes two arcane water attacks.
Arcane Water: Melee Weapon Attack: +8 to hit, reach 10 ft., one target. Hit: 15 (2d12 + 2) bludgeoning damage plus 7 (2d6) force damage.

Arcane Absorption: When a spell is cast within 30 feet of it, the golem absorbs some of the spell's potency. If it is a spell that forces a saving throw, the DC to succeed drops by 2. If it is a spell with an attack roll, the attack roll has disadvantage. The golem regains 20 hp and gains 1 charge point in its Arcane Pool.