Магия "Might & Magic Heroes VI"

It seems to me that the strongest spell isn't Time Stop, but rather the Wave of Nags (the last ability of Tears). Stunning small units for 2 turns and pushing back large ones (especially when the opponent has advanced to your positions) is very valuable. It also gives Nagas an incredible advantage in the form of a quick rush. Following Kirin's path, Kensei units attack enemy archers, and you can forget about those archers for the rest of the battle (due to Kensei's ability, which reduces damage taken by almost half), or finish them off completely during the wave.
In my opinion, offensive magic is only needed for mage heroes and only in the final mission of the campaign, where it allows you to quickly and without losses clear out neutral creatures. In other cases, control spells (Petrification or Time Stop), healing spells, and defensive spells are much more useful.