Blast From the Past: Omegalith for D&D 5th Edition

Ogremoch, jealous that Cryonax has gain an upper hand in the Apocalypse, 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 so the omegalith were wrought.

OMEGALITH                                                                   
Medium elemental, neutral evil                                        ________________________________________________

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

Speed 25 ft.
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   Str            Dex         Con           Int         Wis         Cha
14 (+2)     10 (+0)     16 (+3)     11 (+0)    10 (+0)     10 (+0)

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Condition Immunities petrified

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

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

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Made of Stone. Bludgeoning, piercing, and slashing damage that the omegalith takes from non-magical weapons is reduced by 3.

Enduring. The omegalith has advantage on Constitution saving throws.

Reinforced. When a creature targeting the omegalith rolls a 1 on their attack roll, their weapon breaks.

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ACTIONS

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Slam. Melee Attack: +4 to hit, reach 5 ft. one target.
Hit: 4 (1d4 + 2) bludgeoning damage.

Spear. Melee or Ranged Weapon Attack: +4 to hit, reach 10 ft. or 30/120 ft., one target. Hit: 5 (1d6 + 2) piercing damage.