The Iron Flail-Core is an accessory that makes flail-type weapons have a chance to release a spike ball upon hitting an enemy. This spike ball is larger than the thrown Spiky Ball and similarly rolls on the ground, constantly damaging enemies it touches by a percentage of the flail's original damage, and it lasts for a few seconds.
- 220.127.116.11: Sprite updated.
- 18.104.22.168: Now deals damage based on percentage of flail's damage.
- 22.214.171.124: Introduced.