New addition to Spiritbond

When your gear is 100% Spiritbond it would be cool if you unlock a hidden stat. With Artifact gear it could unlock skill/spell effect bonuses, with Aetherial it could just give an extra stat, ect ect.

Example:
Aetherial Heavy Steel Gauntlets
D: 63 MD: 63
Str:+5 Vit:+5
SS:+6
SpiritBond Bonus: +20 Defense
Note: Being a tank item the +20 Defense helps but it doesn't make you OP.


Example:
Savant's Overcoat
D: 182 MD: 319
Vit:+96 Mind:+101
Piety:+75 Det:+90
SpiritBond Bonus: Eye for an Eye activation rate increased from 20% to 50%
Note: Being the worst spell in the game with this I might actually use it.