Gustav's Holster

Gustav's Holster is an equippable relic that increases the damage of Bouldorbs (the "Boulder" peg shots) for the rest of the run. When equipped, every Bouldorb deals an additional flat amount to its normal hit and a larger flat amount to its critical hit, improving both consistent damage and burst potential from those pegs.

This relic only affects Bouldorbs; other peg types and effects are unchanged. The bonuses are applied directly to the damage calculation for each Bouldorb hit, so they scale linearly with the number of Bouldorbs that strike a target. Because the effect is a flat addition rather than a multiplier, it is particularly valuable early-to-mid runs when Bouldorb base damage is low, and it remains useful later when builds stack many Bouldorbs or rely on critical hits.

• Pairs well with loadouts that generate or duplicate Bouldorbs, such as cards, items, or synergies that spawn extra Boulder pegs; more Bouldorbs increases total benefit.
• Combines effectively with high-crit-rate or crit-damage boosting effects because the relic grants a larger bonus to Bouldorb critical hits.
• Less effective when a build focuses on peg types other than Bouldorbs or on percentage-based damage multipliers that favor high base values; evaluate relative benefit compared to multipliers.
• Since the bonus is flat, stacking multiple sources of flat Bouldorb damage (if available) yields predictable additive increases.