Spur

Unleash

Unleash deals damage based on Osty's current HP, making the healing from Spur a direct damage buff. By keeping Osty at full health, you maximize the burst potential of this attack.

Protector

Since Summoning increases Osty's Max HP, Spur permanently increases the damage floor for Protector. This creates a powerful scaling loop where Osty becomes both a sturdier shield and a deadlier attacker.

Necro Mastery

Necro Mastery converts Osty's HP loss into area-of-effect damage, so healing him with Spur effectively increases your total damage reservoir. It allows you to sustain the companion through multiple hits, repeatedly triggering the mastery's effect.

Bone Flute

This relic requires Osty to be alive and attacking to generate Block for the player. Spur ensures Osty remains on the field even after taking damage, maintaining your primary source of defensive utility.