In-game pickup line
“Summon Monstro”
Mechanics
What Monstro's Tooth does
- Monstro drops onto a target and deals a large impact hit.
- If there are no enemies in the room, the landing targets Isaac instead.
From the game files
Recharge
Standard recharge3 room clears
Standard room-clear recharge. Batteries and other effects can change how quickly it refills.
Achievement #13
How to unlock it
Clear Chapter 1 once.
Unlocking an item and finding it during a run are separate steps.
Explore more unlocksIn a run
Practical note
Use it while an enemy is present, ideally when a strong target cannot easily move away.
Reference
Game data and sources
The item ID, quality and pool listings, icon, game-file tags, and short pickup line come from the extracted Repentance files. This effect explanation is an editorial summary checked against the references below. Repentance+ can differ. Charge and pickup values shown above also come from the extracted items.xml.
