Until version 8.0, the dmg formulas were identical at 7.4, 7.5, 7.6, 7.72 and 7.92. It was only in update 8.0 that they changed.
On this server, the formulas for magic spells and runes are the same as before the 8.0 update.
So, for example: exevo mort hur deals 100% damage like 7.6 or 7.92.