Decreases Isaac's tear delay by 20%, and improves the effectiveness of his other stat upgrades by ~33%. Improves the effectiveness of other stat upgrades by ~20%.
Quote
"Stat booster"
Effects
Boosts speed, range, shot speed and damage if they are above their base values.
Also boosts luck.
Affects stat bonuses from passive items, trinkets that are absorbed or in a second trinket slot and permanent bonuses given by items such as Void.
The extra stat upgrades are approximately 20% of the original.