One branch is chosen on each tier.
Smoke Screen is wider and longer.
Smoke Screen radius increases from 2 to 3 blocks, and blindness lasts 5s instead of 4s.
Blink gains a second charge.
Blink can have an additional use, improving mobility and escape potential.
Enlightenment gives more experience.
Enlightenment grants 300 experience + Intelligence*0.8 instead of only 300 experience.
Black Hole is wider and pulls harder.
Black Hole radius increases from 5 to 7 blocks, and pull strength increases.
Intelligence improves Blizzard.
Blizzard explosion damage gains +Intelligence*0.1 on top of base 24 damage.
Fireball charges faster and harder.
Fireball charge time drops to 2s, and damage/explosion level gains +3, up to 150 damage.
Spell cooldowns are lower.
Mage spell cooldowns are multiplied by 65%, roughly 35% shorter.
Mage moves faster while casting.
During Fireball and Blizzard, movement speed is 75% instead of 20% of normal.
Spellbook caster: selects a spell by held item, deals magic damage, and controls space.