Ditto with what Oldtrees has said here. Do these effects only happen if the attack goes through or do they happen even if all damage is blocked?
Electron : Meh. This + Fire Shield is pretty much win. Can be worked around with medium-high cost though.
Floating: Looks good to me.
Dark : HP regen shield! Looks fun, but again considering Fire Shield here is a good idea.
Ivory: Gives any shield a carapace effect. Don't see why not.
Rocky: Interesting way to implement burrowing as soft CC.
Irregular: What are the effects that can be caused?
Turret : Sounds similar to Ash Shield (
http://elementscommunity.org/forum/index.php/topic,24927.0.html).
Titanic : Might be a bit strong, but I don't think it can be worse than Electron or Dark.
Sooting : Might want to let these stack. Otherwise, they're seriously UP compared to SoG.
Holy : Looks good.
Ancient : I remember Kamietsu doing a shield version of this, I just can't find it. Looks good otherwise.
Fort: Might want to increase the chance.