Alright [@IcePezz] and [@ArenaSnow], so how about we start throwing magic systems into a cocktail. How about:

There are two sets of weaves: One made of positive energy (Life/Divine/etc), one of negative energy(Demonic/Undead). By drawing threads from both these interlaced webs, one creates a magic effect. Drawing strictly from the Positive Weave, one gets divine magic and healing. Drawing exclusively from the negative weave begets necromancy and all sorts of blasphemous funtimes. Drawing from both indiscriminately causes the positive and negative to cancel out, allowing manipulation of nature and energy. Separating the two kinds of weaves from one another is naturally extremely difficult. Deriving positive threads is normally done by good-aligned gods and angels, and negative threads are usually pulled by evil-aligned gods and demons/devils. Mortals can separate them, but they usually cannot do it as well or as easily as supernatural beings of the proper alignment. Isabeau can naturally separate Negative threads from the weave without trying too hard (the basis of her shadow powers), which makes her an anomoly.