Special Trait Name: Metamagic

Adamant is able to cast a spell as a bonus action 2 times.

Spellcasting. The [monster name] is a #-level spellcaster. Its spellcasting ability is [ability score] (spell save DC #, +# to hit with spell attacks). The [monster name] has following [class name] spells prepared:
Cantrips (at will): Frostbite, Mold Earth, Shape Water, Message, Mage Hand
1st level (4 slots): Fog Cloud, Chromatic Orb, Shield
2nd level (3 slots): Mirror Image, Scorching Ray

• Attacking at long range doesn't impose disadvantage on your ranged weapon attack rolls.

• Your ranged weapon attacks ignore half and three-quarters cover.

• Before you make an attack with a ranged weapon that you are proficient with, you can choose to take a -5 penalty to the attack roll. If that attack hits, you add +10 to the attack's damage

After 5 minutes, the boss Supercharges for a turn, Granting access to it's legendary action prior to self destruct(Automatically triggered at 10% hp)

Action Ranged Attack.

Sticky Grenade:

Range: 30 feet, 1 action. Places a sticky grenade holding a spell crystal on an enemy, range 10ft(+5 per spell level). Forces a Con save upon detonation(bonus action after placement, can wait for multiple to detonate at once)

.1A Charge: Adamant places a charge plate on the floor(10 feet square), For every turn spent on this plate the grand finale charges 1d10 more damage.

3A Grand Finale: Adamant faces a direction, and after charging for 3 rounds fires off a ray(30 feet in size, 200 feet in distance). Does 2d10(+1d10 per spell slot remaining, +1d10 per turn on the plate). Forces a dex save for half damage.