Hero's Backpack

Hero's Backpack is a relic that buffs orbs in the player's magazine based on consecutive identical orbs that follow each orb. For every adjacent orb of the same type after a given orb, that orb gains additional flat damage and critical damage values. The effect applies to all upcoming orbs in the magazine and excludes Pebballs after the v1.0.6 rework, which made the relic grant +1/+2 to all non-Pebball duplicate orbs you own.

The formula implemented in game files expresses the bonus as +{[BP_ADJ_DMG]}/+{[BP_ADJ_CRIT]} for each following connected same-type orb. Japanese, Korean, and Chinese localizations describe the same adjacency mechanic: each orb gains the listed stat increases for every adjacent identical orb within the magazine.

Hero's Backpack strongly encourages deckbuilding that produces long runs of identical orbs rather than a highly varied magazine. The relic pairs especially well with effects that duplicate orbs, remove unwanted orbs, or otherwise consolidate orb types. Events that duplicate the magazine or selectively remove orbs increase the chance of creating longer consecutive chains and therefore larger per-orb bonuses.

Practical interactions and strategic notes:

• Duplicate events are high-value: choosing options that duplicate multiple orbs generally raises the probability of longer consecutive runs and larger buffs, though duplicating everything can also introduce additional orb types that interrupt chains.
• Remove events usually favor removing a single disruptive orb to preserve or extend an existing chain rather than clearing many and breaking potential sequences.
• Synergies with orbelisk and stone/pebball strategies are powerful: having many stones (or high-level orbelisks that spawn stones) multiplies the benefit because stones both benefit from the Backpack buff and contribute additional separate damage sources. Level 2 orbelisk with bouldorb can also work, but stones are easier to obtain and can hit flying enemies.
• After v1.0.6 the relic no longer buffs Pebballs, so builds that rely primarily on Pebballs receive less benefit; prioritize non-Pebball orb types when planning around this relic.
• The relic rewards deliberate magazine management—deck choices, event selections, and items that clone or filter orbs are the primary ways to maximize value.

Hero's Backpack was added in partnership with and as a reference to the indie game Backpack Hero; its addition coincided with the Rucksack Roguelikes Steam Bundle release. It was introduced in v0.7.48 and reworked in v1.0.6 to its current behavior.