Bloodlust

Bloodlust gives a 7.69%, or roughly 1/13 chance to heal 1 HP when an enemy dies. This can occur even when at full health and is not doubled by Second Stomach.

The effect is indicated by a heart forming and then dissolving into blood over your mutant.

Building

Bloodlust is a strong healing option that scales well with the increased Enemy density of Loops and like Lucky Shot, has the advantage of instantly giving the resource instead of spawning a Pickup like other healing Mutations.

Other Mutations

Synergies

• Bloodlust can help recharge Strong Spirit.

Similar Role

• Confiscate and Rabbit Paw can serve as alternatives to Bloodlust that also help your ammo economy.
• Comparatively Second Stomach is better insurance and has better synergy with other mutations, though there's nothing stopping you from taking both.
• Horror's Throne Butt provides HP while using the Radiation Beam, allowing it to heal while killing enemies and protecting itself or trade Rads for HP. However, Horror's Throne Butt is very lackluster outside of healing.

Characters

Desirable

• Chester trading HP for ammo will be less of a trade-off with Bloodlust.
• Chicken can revive with healing from Bloodlust and will generally stay alive longer with it.
• While she has high survivability and her max HP leads her to get more Medkits than other mutants, Crystal will still get use out of Bloodlust and can help her recharge Strong Spirit.
• Gator, Scorpion and Snake may get a refund on HP spent on their active abilities.
• Rebel can spawn more Allies with Bloodlust.
• Skeleton can continually use Blood Gamble with less risk if kills heal it, especially with Damnation.

Lower Priority

• If taking Confiscate, Fish may prefer Rabbit Paw or Second Stomach to Bloodlust.
• Horsie gets more use out of Second Stomach.
• Bloodlust is almost useless on Melting due to their low health and remains fairly undesirable when paired with Rhino Skin.
• Robot has much better synergy with Second Stomach, especially paired with Heavy Heart, Regurgitate and its Throne Butt.

Crowns

Synergies/Helpful for Unlocking

• The extra enemies spawned from Crown of Blood will mean more HP healed from Bloodlust
• Crown of Hatred is more sustainable with Bloodlust's healing.
• Crown of Life and Crown of Luck will have their downsides made less severe by Bloodlust, with Luck directly helping Bloodlust trigger.
• Bloodlust can help avoid the chain of compounding disaster caused by Crown of Risk, being one of the few ways to heal without pickups.

Anti-Synergy/Not helpful for Unlocking

• Crown of Haste is better paired with Rabbit Paw or Second Stomach to make the most of the extra pickup value.