Crystal Golem (Quartz)

Immutable Form (Quartz). The golem is immune to any spell or effect that would alter its form. Any attempt to do so is rebounded on the caster. In addition, the Quartz Golem is vulnerable to force and blunt damage. Being hit by force and blunt damage causes shards of quartz to spray out towards the source of damage dealing damage equal to the damage the golem took.

Magical Resonance (Quartz). The golem has disadvantage on saving throws against spells and other magical effects and always casts spells at base level without needing materials or spell slots. While in the presence of other Quartz Golems, the spell levels learned through Crystal Resonance (Quartz) are cast at a level higher for each Quartz Golem within 120 feet.

Magic Weapons. The golem's weapon attacks are magical.

Crystal Resonance (Quartz). The golem learns spells and class abilities used in it's range of sight.

Multiattack. The golem makes two slam attacks.

Slam. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 19 (3d8 + 6) bludgeoning damage.

Slow (Recharge 5–6). The golem targets one or more creatures it can see within 10 feet of it. Each target must make a DC 17 Wisdom saving throw against this magic. On a failed save, a target can't use reactions, its speed is halved, and it can't make more than one attack on its turn. In addition, the target can take either an action or a bonus action on its turn, not both. These effects last for 1 minute. A target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Shield. An invisible barrier of magical force appears and protects you. Until the start of your next turn, you have a +5 bonus to AC, including against the triggering attack, and you take no damage from magic missile.