Mercury Titan (5e Creature)
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Gargantuan giant, lawful good
Saving Throws Con +7, Int +10, Wis +7, Cha +6
Innate Spellcasting. The giant's innate spellcasting ability is Intelligence (spell save DC 19). It can innately cast the following spells, requiring no material components:
At will: acid splash, charm person, detect magic, detect thoughts, fireball, fog cloud, lightning bolt, mage hand, magic missile, prestidigitaion, ray of frost
Magic Resistance. The giant has advantage on saving throws against spells and other magical effects.
Magic Weapons. The giant's weapon attacks are magical.
Mystic Cheat (3/Day). If the giant fails on a saving throw against a spell or other magical effect, it can choose instead to succeed instead.
Spell Quickdraw. The giant can cast a spell of its choice as a bonus action.
Multiattack. The giant makes two quarterstaff attacks.
Quarterstaff. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 18 (4d6 + 6) bludgeoning damage or 24 (4d8 + 6) bludgeoning damage if used with with two hands.
Rock Ranged Weapom Attack: +10 to hit, range 60/240 ft., one target. Hit: 26 (4d10 + 6) bludgeoning damage.
Arcane Blast (Recharge 4-6). The giant creates a 60-foot radius explosion of arcane energy centered around itself. Each creature in that area must make a DC 18 Dexterity saving throw. On a failed save, a creature takes 60 (12d10) force damage and 24 (6d8) thunder damage and is knocked prone. On a successful save, the creature takes half as much damage and isn't knocked prone.
Summon Elemental (1/Day). The giant summons one of the four types of elementals. The summoned elemental appears in an unoccupied space within 60 feet of its summoner and acts as an ally of the summoner. It remains for 10 minutes until it dies, or until its summoner dismisses it as an action.
Mercury titans are practically an embodiment of the arcane arts. The blood in their veins glows with magical essence and eyes sparkle, even with no light. Static electricity constantly crackles around their skin and their hair seems to always wave, if slowly and very slightly. Such a creature has been sought out by powerful magic users for ages, unfortunately, they're even rarer and reclusive than mercury giants and even shut out their own kind, as their powerful magical essence has affected them with severe paranoia.