Fire Absorption. Whenever Trobriand is subjected to fire damage, it takes no damage and instead regains a number of hit points equal to the fire damage dealt.

Immutable Form. Trobriand is immune to any spell or effect that would alter its form.

Magic Resistance. Trobriand has advantage on saving throws against spells and other magical effects.

Magic Weapons. Trobriand's weapon attacks are magical.

Spellcasting. Trobriand is an 18th-level spellcaster. His spellcasting ability is Intelligence (spell save DC 20, +12 to hit with spell attacks). He has the following wizard spells prepared:

Cantrips (at will): fire bolt, mage hand, prestidigitation

1st level (4 slots): detect magic, magic missile, shield

2nd level (3 slots): blur, detect thoughts, misty step, shatter

3rd level (3 slots): counterspell, dispel magic, fireball, haste

4th level (3 slots): blight, greater invisibility

5th level (3 slots): animate objects, Bigby's hand, scrying

6th level (1 slot): chain lightning, globe of invulnerability

7th level (1 slot): finger of death, forcecage

8th level (1 slot): incendiary cloud, power word stun

9th level (1 slot): power word kill

Multiattack. Trobriand makes two melee attacks.

Slam. Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit:20 (3d8 + 7) bludgeoning damage.

Sword. Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit:23 (3d10 + 7) slashing damage.

Poison Breath (Recharge 5–6). Trobriand exhales poisonous gas in a 15-foot cone. Each creature in that area must make a DC 19 Constitution saving throw, taking 45 (10d8) poison damage on a failed save, or half as much damage on a successful one.