Very helpful when fighting late game bosses.

Items that grant temporary invulnerability like Celtic Cross or The Polaroid allows unlimited usage of Razor Blade for free while invulnerable, granting a huge damage boost.

r/bindingofisaac - A fun and interesting The Binding Of Isaac fact for.

The Last-Will Symbol of Razor Blade will be blank if you killed yourself with it. You have to kill Satan with Eve to unlock the Razor Blade itself before Eve will.

According to Edmund in this video, using the Razor four times results in double damage for that room.

Using the Razor Blade will count as damage for 'No-Damage-Runs'.

Otherwise, it takes Eternal Hearts first, then Red Hearts. Pays Soul Hearts if Isaac has less than one full Red Heart. Final Damage increment on each use decreases with the number of repeated usages because of the square root 'soft cap' in the damage formula. Isaac pays a full heart in normal state but half a heart while recovering from damage (Isaac blinking).īasic Damage is increased by 1.2.

Allows trading hearts for more damage in the current room upon each activation.

Binding of isaac razor blade