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|Sub Type||Boss Monster|
| 80 / |
|Summoned By||wave 7 of Old One's Army|
| Betsy Trophy|
|Sky Dragon's Fury||25%|
| Treasure Bag(Betsy)|
Betsy is a hardmode event boss that appears at wave 7 as the final boss of the Old One's Army. Betsy's attack patterns include swooping down at the player, breathing fire, and circling the area. She doesn't intentionally target the crystal, focusing on the player instead. When she is defeated, the old one's army event ends.
- Added to the game.