Cruel Crystal Blade is a consumable in Damnation, a mod for The Binding of Isaac.

Does not spawn naturally and can only be obtained by using Unused Draft Paper on Planetarium items.

On use For the rest of the run, killing an enemy will has 10% chance to spawn a random rune (no matter unlocked or not) that will disappear after 3s.

Every time Isaac uses a rune, enemies in the current room takes +25% more damage.

Every use will increase the value in green by 10% for the entire run.

The following special synergies and interactions for Cruel Crystal Blade have been documented.

* Note that not all possible synergies and interactions are listed here.

• Download Damnation from the Steam Workshop.