I have a question regarding this segment:

"📈 Primordial levels (81–120): some spells change their power little by little after level 80, according to the level of who casts them. At level 120 they have:

Master Possession: 30%
Life Drain: 80%
Mirror Attack: 15%
Defense Break: 80%
Paralyze: 80%
Berserker Attack: 55%
Destruction: 10%
The Sight: 130%
Mirror Wall: 60%
Dragonbreath: 55%
Counter Attack: 120%
Inflict Wound: 70%
Rage: 140%
Poison Bite: 70%
Dizziness: 78%
Insanity: 78%
Persistence: 10%"

It says that some spells change their power, but are we talking about an increase or a decrease?

Lets take Master Possession as an example:

i 30% increase would make it around 20%

A decrease would make it about 11%

What is the correct way to interpret this?

Thank you!