Intimidating Presence. Once the dracominus enters combat all creatures that can see as disadvantage against it and its allies via its wings making it appear two sizes larger.

Spellcasting. The Adamantine Dracominus is a 2nd-level spellcaster. Its spellcasting ability is wis (spell save DC 13, +2 to hit with spell attacks). The Violet Dracominus has following spells prepared:
Cantrips (at will): fire bolt, ray of frost, thorn whip
1st level (2 slots): Cure wounds, Fog cloud, Entangle                                                               2nd level (3 slots): flock of familiars, Mirror image, Shadow Blade, Cloud of daggers

Breath Attack. The adamantine dracominus unleashes a 20 by 20 ft cone, all creatures within it must succeed a DC 12 Con saving throw or take 5d12 cold damage.

Chomp. Melee Weapon Attack: +2 to hit, reach 5 ft., 1 target. Hit: 3d6 + 2 piercing damage. 

Frost shot. RangedWeapon Attack: +2 to hit, range 1/240 ft., 5 target. Hit: 3d8 + 3 cold damage.

Quick Venom bite. Target must succeed a DC 12 Dex or take 2d6 piercing and they then must succeed a DC 12 con save or take 1d6 cold damage for 1d4 turns after.