Crystal-ants

      These ants live in the underground depths of the Ghara planet, feeding off semicrystalline plants. A single ant is five centimeters long, it is blue colored and so translucent one can see its organs. Blind, the antennaes are excellent in detecting vibrations. When they rub their legs in each other, a piezoelectric effect creates static electricity which they use to communicate. Swarms can electrify much larger creatures. The shovel-shaped mandibles can grind rocks. Like certain surface ants, they can organize themselves into structures and even creatures that combine strentgh, electricity and a remarkable collective intelligence. The dwarfs of the Kurskgrad Underground Confederation managed to establish deals with many hives. The ants serve them as ore grinders, miners, instant bridges, beasts of burden, early warning against invaders, living armour, money and even as crystalline golems which get smarter according to their size.

Crystal-ant

Tiny beast, unaligned

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Armor Class 14 (natural armor)
Hit Points 4 (1d4 +2)
Speed 20 ft., burrow 5 ft.

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STR	DEX	CON	INT	WIS	CHA
4 (-3)	10 (+0)	14 (+2)	2 (-4)	10 (+0)	4 (-3)

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Senses Tremorsense 10 ft., passive Perception 10
Challenge 0

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ACTIONS

1. Bite. Melee Weapon Attack: +0 to hit, reach 5 ft., one target. Hit: 1 bludgeoning damage.

Golem-swarm of crystal-ants

Large swarm of tiny beasts, unaligned

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Armor Class 16 (natural armor)
Hit Points 105 (11d10 + 44)
Speed 30 ft., burrow 20 ft.

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STR	DEX	CON	INT	WIS	CHA
20 (+5)	10 (+0)	18 (+4)	8 (-1)	15 (+2)	10 (+0)

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Damage Resistances bludgeoning, piercing, slashing from non-magical weapons
Condition Immunities charmed, frightened, grappled, paralyzed, petrified, prone, restrained, stunned
Senses Tremorsense 180 ft., passive Perception 12
Languages understands kurskian* but can't speak
Challenge 8

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• Tunneler. The golem-swarm can burrow through solid rock at half its burrowing speed and leaves a 5 foot-wide, 8-foot-high tunnel in its wake.
• Immutable Form. The golem-swarm is immune to any spell or effect that would alter its form. 
• Swarm. The golem-swarm can occupy another creature's space and vice versa, and the golem-swarm can move through any opening large enough for a Tiny insect. The golem-swarm can't regain hit points or gain temporary hit points.

ACTIONS

1. Multiattack. The golem-swarm makes three bites attacks. 
2. Bites. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 10 (4d4) bludgeoning damage plus 10 (3d6) lightning damage, or 5 (2d4) bludgeoning damage if the golem-swarm has half of its hit points or fewer. 

 *russian in real life.