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The Ancient Serpent

Eternal Caves

Boss

DropsRunebreaker (a powerful multi-purpose mining tool) — only obtainable if the player collects all five gemstones during the fight
Hostilityboss
SpawnsAncient Grove biome, at the Ancient Serpent Altar
StrategyReaching the fight requires collecting five elemental runes from different biome shrines and activating five statues with matching runes to summon the boss. The boss changes behavior with every stage, becoming smaller, faster, and harder to hit as the fight progresses. Described as one of the hardest encounters in the addon, requiring strong late-game equipment.

Described in the wiki as "a massive petrified, snake like rock formation, as if a giant creature was turned to stone long ago," surrounded by ancient statues. No entity id, exact health value, or image was documented/found on the wiki.

Sources