[1.2.379] More Magician Tweaks

My thoughts:

- About time Fire Arrow got a new icon.
- Not surprised at Booster going to -2.
- Mist Eruption feels a bit too strong. The hitbox on that thing is massive and it does a lot of damage.
- Glacial Chain is ludicrously strong. Massive range, pulls monsters, ignores defense, 1800% damage, DoT, hits 12...and only takes 10 points.
- Priests lose 10% crit rate for 20% mastery. ME GUSTA.
- Priests also get Spell Booster. ME GUSTA. Priests taking forever to cast things always irritated me.
- Angel Ray looks badass.
- And lastly, I wish they would change summons to be less horrible.

EDIT: I dun goofed.