This making spells not based on weapon damage, but making weapon skills based on weapon damage shit that the industry is so into? It needs to stop.
what?
It's not the multiple-attribute-dependency thing that Demo brought up.
It's that in some (many?) games, weapon-based skills scale with weapons, with a damage stat, and various modifiers. Spells will occasionally benefit from a +spell damage effect on an item or some such, but most of the items casters get don't impact their damage output (etc.) nearly as much as that of the weapon-skill users. Watching games in beta, where the balance hasn't yet been worked out yet, is pretty painful. Some games never get it right, even after release.
Mythos's present state (being a beta, maybe it's excusable) of balance is absolutely up-side down. Casters benefit from %-based damage bonuses on all slots but weapons (probably a bug) and get no damage from wisdom or the other things I'm about to list for others. Melee/gunners benefit from str/dex (which contribute to %-based damage bonus), flat elemental and non-elemental damage bonuses, and scaling from their weapons.
Oh, %-based bonus damage also has a cap of like 200, which the casters can hit with either a) a good robe and 4-5 good items of other slots, or b) investment in a "talent" that halves their total hp for about 150% bonus and 2-3 good non-robe items.
Blah.
But, well...
BETA.