Weapons should have weak variants of stronger spells

Magic on weapons tends to play the leading role in spell casting and magic damage. This is an issue because actual spells are very limited. Spellcasting feels less like spellcasting when you need to level the skill through other weapons, which often have their own skill prerequisite.
This should be changed so that the magic on weapons are just a weak variant of an existing spell that players can use. This will greatly expand the spell library, and allow us to comb over skills that don't see use in some weapons. Along with this, weapon's spells are expected to see a nerf, as they will be a weak variant of the upcoming spell.

The issue names no files, tests, or entry points. Start by locating the weapon magic and existing spell definitions, then determine how each weapon spell maps to a weaker existing or upcoming spell. Done means the weapon spells are weak variants, are appropriately nerfed, and the available spell library is expanded.