Apply Part Of X To Y

You can gain an extra bonus to stat Y when you raise stat X. Typically if X is negative, Y is not lowered.

Note: Direct bonuses are calculated first; then Apply part of X to Y is applied; (then Use X instead of Y if X is higher). If your attributes are reduced to less than zero during the "direct" calculation, they capped at zero, then the "Apply part of X to Y" is added.

For example: if you have equipment that gives -9999999 Perception, and then an item that applies part of something for +2 Perception, you will always have exactly 2 Perception.

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Legend
Limited items	Quest items
Unearthly items	No trade items
Derivative unearthly	Normal items

Bonuses

Bonus	Source	Formula
Bonuses to your Etheric Defense also apply to your Reflexes	solid shark hologram	Ref += ED
Bonuses to your Etheric Defense also apply to your Strength	solid shark hologram	Str += ED
Bonuses to your Etheric Defense also apply to your Will	solid skull hologram	Will += ED
Bonuses to your Etheric Defense also apply to your Perception	solid spider hologram	Perc += ED
Applies half your Melee Defense to Etheric Defense	shield of scales	ED += MD/2
Applies a third of Stealth Power to Ranged Power	Zalian defense system, Zalian defense tool, Zalian multiweapon	RP += SP/3
Applies a third of Stealth Power to Melee Power	Zalian weapons (above) with Zalian Blade active	MP += SP/3
Applies part of your Etheric Defense to Ranged Power	holosight rifle, solid gunman hologram	RP += ED/3 (with one) RP += ED (with both)
Applies some of your Etheric Power to all Perception Techniques	Fluid Focus with lens equipped	PTTUP += √EP
Applies part of your Will to any lower attributes	ferry coin	Perc += √Will (when lower) Str += √Will (when lower) Ref += √Will (when lower)
Applies Stealth Power to Lowest Attribute(s)	trick top hat	Low Attr += SP
Increases Muffled Sight's effects by your Fire Power	Legion's Eyes	ED += FP EP -= FP
Increases your Etheric Defense when your Will is at its highest	Lord of Nightmares	ED += Will modifier (if positive)
Increases your Etheric Power when your Will is weakest	Slave to Nightmares	EP -= Will modifier (if negative)
Your Evasion Power is also applied to your Etheric Defense	Demon Slayer	ED += EvP
Your Evasion Power is also applied to your Fire Defense	Fire Dancer	FD += EvP

Notes

Except for Slave to Nightmares, all(?) these seem to only apply if the relevant attribute is positive. (Eg. the trick top hat has no effect if you have negative Stealth Power.)

See also

Use X Instead Of Y If X Is Higher