Monster levels
Pick a monster and drag the level. Every level adds the same fixed health, armor and resistance, which is also how New Game+ and the upscaling option raise enemies. Full entries are in the bestiary.
Essence1,760
Armor0
Experience12
Fire resistance3%
Shock resistance3%
Aard resistance3%
Axii resistance103%
Each level adds the same fixed amount of Essence, armor and resistance.