What to know
- The Kill Spring is a Tediore legendary Repkit that converts excess damage on kills into healing orbs for you and allies.
- It drops exclusively from the Axemaul boss in the Carcadia District's Abandoned Auger Mine.
- Ideal for melee-focused builds, it boosts survivability by regenerating health, armor, and overshield mid-fight.
- Farm it post-main mission "The Falling Wall" for repeated chances at this high-value loot.
You grab the Kill Spring early in Borderlands 4's Dominion arc, and suddenly those reckless charges into enemy packs feel a lot less suicidal. This Tediore Repkit flips the script on aggressive play, rewarding your overzealous trigger finger with a cascade of restorative orbs that keep you swinging when others would be reloading at a med station.
Kill Spring in BL4 at a glance (what the repkit does and why it matters)
Kill Spring’s signature is Blood Siphon — when you secure a kill, the repkit converts excess damage into healing orbs that travel to nearby allies. That means the more overkill you do (or the more kills you get in quick succession), the more healing the item produces for your team. Because it produces team-healing orbs rather than self-only heals, it’s especially valuable in co-op or for players running aggressive, kill-heavy builds.
Kill Spring technical summary
| Property | Value |
|---|---|
| Type | Repkit (Tediore) |
| Rarity | Legendary |
| Signature effect | Blood Siphon — on kill, converts excess damage into healing orbs that seek allies |
| Typical drop source | Axemaul (boss) — Abandoned Auger Mine, The Toil of Spoiling Vis, Carcadia District (Dominion) |
| Notes | Healing orbs typically do not target some summoned minions; exact numbers (health/sec, cooldown) can shift after patches |
Kill Spring location and farming guide: Step by step instructions
Here is a step-by-step guide to acquiring Kill Spring:
Step 1: Reach Carcadia Zone
Progress in Borderlands 4's story until you unlock access to the Carcadia area, a region known for its hazardous mines and alien creatures.
Step 2: Locate The Toil of Spoiling Vis
Within Carcadia, find the Abandoned Augur Mine region named "The Toil of Spoiling Vis." This area contains the boss that drops Kill Spring.
Step 3: Defeat the boss Axemaul
- Find and defeat Axemaul, the boss enemy in The Toil of Spoiling Vis. Axemaul drops the Kill Spring repkit as loot upon defeat.
Step 4: Collect the Kill Spring repkit
After killing Axemaul, pick up the dropped Kill Spring. It may take several attempts or respawns to acquire the repkit if you don't get it on the first drop.
Step 5: Equip Kill Spring on your character
Once obtained, equip it to benefit from its healing properties during combat, especially in multiplayer modes.
How to pair Kill Spring with weapons, ordnance, and builds
| Pairing type | Why it works |
|---|---|
| Fast-kill or overkill weapons (AOE launchers, burst-fire rifles, explosive ordnance) | More kills and excess damage per shot create more Blood Siphon procs, generating steady healing orbs. |
| Melee or close-quarters builds | Frequent melee kills at short range maximize orb creation, keeping you and allies healed during mob fights. |
| High-burst throwables or ordnance | Throwing knives, cluster grenades, or other burst-damage tools create multiple quick kills, amplifying orb output. |
| Co-op squad setups | Healing orbs automatically seek teammates, making Kill Spring ideal for team sustain without sacrificing your own offensive tempo. |
| Solo mobbing playstyles | Even alone, the orbs heal you consistently as long as you chain kills, keeping your aggression high. |
Why Kill Spring is worth farming (and when it isn’t)
- Worth it when you run kill-heavy or aggressive builds as it converts offensive output directly into sustain.
- Worth it for co-op play as the healing orbs benefit allies, doubling as team utility.
- Less useful if your build rarely overkills or kills slowly — you’ll see fewer procs and limited payoff.
- Orbs may not target certain summoned units, so synergy with minion-heavy builds is limited.
Wrap-up: Should you chase Kill Spring?
If you enjoy aggressive, kill-heavy builds or play co-op frequently, Kill Spring is a high-utility Legendary repkit that translates your offensive performance into team sustain. Farming is straightforward — Axemaul in the Abandoned Auger Mine is the named source — but expect RNG. If you value sustained team survivability tied directly to your kills, it’s worth the farm.
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