personally im split, i think that the idea is amazing but it also have some things that bothers me.
i think you should pick that either no skills or every skill is bound to a gem, if they should make this every skill should be bound to a gem, not just magic but also physical skills such as a greatswords cleave and an archers multishot, if not then i think every mage character would be somewhat forced to also use a physical weapon or they would be inferior to a warrior using teleport though.
remember all of this is personal opinion
assuming that this is the case i think more of this as a path of exile system, every skill was bound to gems which you could equip and level, with certain requirements (such as a specific amount of dexterity or intellect)
the biggest difference being that these gems were skill specific. so a ‘‘Cleave skill gem’’ ‘‘Leap skillgem’’
this being my biggest problem with the idea of the spell depends on where you equip, i love the fact that the different magic types are so different and i think that should be kept, but i think they should be specific skills that would stay the same no matter which piece you put it in to allow for more skillbuild freedom.
example instead of having a seer shard you would have
Seer Shard: Eagle Eye
Allows the wearer to zoom his ranged weapon x%
Seer Shard: Survival sense
Allows the weared to detect nearby hostiles
Seer Shard: Combat Experience
Gives the wearer an aleart whenever an attack is incoming
this would allow for greater freedom in builds, but also allow a sort of scaling through levels so some gems might only be equipable in tier 2/3/4 armor etc…
then just have 1 available gem slot for each equipment piece and i think rather than crafting in it should be physical shards you can equip and unequip at any time, (in case you want to change builds for a boss or the likes)
again if you also combined skills to this which focused on different stats (Rage shard for strength, Nimble shards for agility… etc…) and then weapon skills it would be an epic system for oort.
ps i love the drawings mate