Elemental Evil: Omegalith for D&D 5th Edition

Ogremoch, jealous that Cryonax's Cold Ones could turn the Apocalypse too much in his favor, hatched a plan to bolster his own presence on the fields of Armageddon.  The Prince of Elemental Earth enlisted the medusa Stonecaller, Zhwaa Lo'Sel, to use her dark gifts to transform his enemies into faithful agents of Elemental Earth--and the omegalith were wrought.

OMEGALITH                                                                                   Medium elemental, neutral evil                                        ________________________________________________

Armor Class 16 (natural armor)
Hit Points 20 (3d8+6) 

Speed 25 ft.
________________________________________________

   Str            Dex         Con           Int         Wis         Cha
14 (+2)     10 (+0)     16 (+3)     11 (+0)    10 (+0)     10 (+0)

________________________________________________

Condition Immunities petrified

Senses darkvision 60 ft., tremorsense 30 ft; 
passive Perception 10

Languages Primordial, Terran
Challenge 1/2 (100 XP)

________________________________________________

Enduring. The omegalith has advantage on Constitution saving throws.

________________________________________________

ACTIONS

________________________________________________

Spear. Melee or Ranged Weapon Attack: +4 to hit, reach 10 ft. or 30/120 ft., one target.  Hit: 8 (1d10 + 2) piercing damage.