Ars Magica GRIMOIRE

[ironboundtome]

A spell to alter another spell so that it is always considered optimised for the target.

Inhibit the Selfish Deviations of the Warp
Muto Vim Gen, R: Voice, D: Momentary, T: Individual

This spell alters the target spell so that it is considered tailored for the caster, as if the target spell was designed for the caster to not cause warping. This spell may alter any effect which is equal to the Muto Vim spell level less one magnitude (spell level -5). It is designed with Range Voice because it must be cast cooperatively with another wizard to limit the warping effects of their spells.

(Base of a Significant Change to less than or equal to spell level +1 mag, target own spells as +2 Voice)

Concept discussed here