Buy Borderlands 4 Kill Spring Repkit and unlock one of the most powerful sustain tools in the game. Convert 100% overkill damage into healing orbs, restore armor segments, and dominate wave farming with infinite sustain.
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Buy the Borderlands 4 Kill Spring Repkit and unlock one of the most broken sustain mechanics in the game. The Kill Spring converts 100% of excess damage from kills into healing orbs that actively seek out allies, turning your offense into endless sustain.
This legendary repkit is ideal for farming waves of enemies, letting you heal passively while tearing through mobs. Combine it with other meta shields like Firewerks or Onion Shield to create a self-sustaining loop of destruction.
The Blood Siphon passive is what sets Kill Spring apart from other repkits. Instead of requiring manual actions or cooldowns, it converts 100% excess damage from kills into homing healing orbs. This means the stronger your DPS becomes, the stronger your sustain grows — an infinitely scaling mechanic.
Even more importantly, Kill Spring does more than just heal: it also restores Armor Segments whenever you receive healing. This hidden interaction enables endless loops with other legendaries. For example:
No other repkit in Borderlands 4 offers this level of synergy between offense, sustain, and defense.
Kill Spring has quickly become a meta-defining repkit because it perfectly supports the high-velocity gameplay of Borderlands 4. Instead of slowing down to heal or relying on consumables, you heal automatically by killing enemies — something every Vault Hunter is built to do.
For players who farm waves of enemies, this means sustain without downtime. For co-op groups, it turns you into a natural healer, since the orbs also benefit teammates. In combination with kill-based builds (like Vex’s Grave Assault or Amon’s Gathering Storm), Kill Spring fits seamlessly into the most popular high-DPS playstyles.
At higher levels, it is considered mandatory in many farming builds, simply because it eliminates the need for external healing and frees up your focus to maximize damage output.
No, it’s a random legendary drop. However, our boosters will continue farming until the Kill Spring Repkit is secured for you.
Kill Spring’s Blood Siphon passive generates homing orbs that track and heal nearby allies as well. It’s one of the rare items that improves both solo and co-op play.
It’s most effective in mob-heavy encounters since its effect requires kills to trigger. For boss fights, it still provides sustain when adds are present, but shines brightest in farming or wave content.
Any build focused on sustained killing power. For example, Amon’s melee Forgeknight setups and Vex’s crit-heavy Grave Fiends builds gain huge value, as each kill resets the sustain loop.
Kill Spring is part of one of the most infamous combos in Borderlands 4: