Dirty_Player
Auto-translated
Since we're already talking about Wizards, I'll add something that some might not know. If a Wizard casts a spell, for example, Slow, it lasts for 3 rounds. But if a hero has a basic Slow skill and applies it on top of the Wizard's Slow, the unit will only have the effect of the expert Slow, but the duration will be extended by the hero's spell power. The same applies to any spell.