The Lesser Magma Avatar is a 3rd Level Spellcaster. Wisdom is its spellcasting ability, it has a Spell Save DC of 15 and +7 to hit. It also has the following spells prepared.
1st level (3 slots). Hellish Rebuke
2nd Level (2 slots). Aganazzar's Scorcher, Scorching Ray, Maximillian's Earthen Grasp
3rd Level (1 slot). Erupting Earth, Melf's Minute Meteors
Volatile Presence. Volatile Magma Elementals can only exist within 60ft. of the Lesser Molten Avatar, leaving this range the Volatile Magma Elemental harmlessly dissipates.
Being targeted by an attack, ability, moving into another creatures space or an ally being attacked within 5ft. of the Volatile Magma Elemental, it detonates, Imposing a DC 15 Dexterity Save to all creatures within 5ft. and dealing 3d6 Bludgeon + 2d6 Fire damage upon a failed save and half on a success.
Volcanic Lash Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 8 (1d8+2) Bludgeon damage plus 7 (2d6) Fire damage. Molten Shell (Recharge 6). Covering itself in a dense layer of molten rock, the Lesser Magma Avatar gains 30 Temporary HP and +2 AC. at the start of the next Lesser Magma Avatar's Turn, the shell explodes, imposing a DC 15 Dexterity Saving Throw, dealing an amount of fire damage equal to the remaining Temp HP of the shield as Fire damage on a failure and half damage on a successful roll. Temporary HP gained by Molten Shell is lost after dealing damage.
The Lesser Molten Avatar has 2 legendary actions.
At an Initiative of 20 (losing ties), the Lesser Molten Avatar may use a Lair Action and may not use the same lair action twice in a row.
All Molten Avatars make their home on a layer of hardened magma, precariously afloat on a great well of molten rock and metal.
The presence of a Molten Avatar begins to convert the area into a dry, hot wasteland that if left for long enough will violently erupt into an ever flowing volcano.