I see now.

Here is the logic behind those changes.

Due to several reasons (popular demand; AI not being able to work with the new change; effectiveness in combat questionable) we reverted berserk to its old behavior but made mana demand high.

At this point dark was very strong with so many mind control spells (Blind, Puppet, Berserk, forgetfulness ). Because Puppet Master and Berserk are very similiar Puppet Master was moved to Summoning with the name Hypnotize. It fits perfectly in the theme as Summoning is a bag-of-tricks school.
Forgetfullnes is also weaken and moved from tier 3 to tier 2. Teleport comes in Tier 3 to fill the spot and adds some utility to the school. Teleport fits thematically with Urgash (Vampires, Devils).

Light is weaker than other schools so we moved Tier 5 Shield spell from Summoning to Light. Blesses also received significant buffs. Vengeance is lowered to T4 because its potential is unreliable.