The only use I see in the level 6 wizard upgrade is the awesome look they get.
Damage per hit only increases by 15 what doesn't even tickle higher level buildings.
Their HP also only increases an unnoticeable bit.
The only thing that really increases is the cost to build wizards.
If you would buff their level 6 upgrade you would probably make them too OP.
But if you would nerf their level 5 upgrade the level 6 upgrade would be worth the elixier again!
Maybe you should give them +30 DPS and only +16 HP for level 5 and keep the stat upgrades for level 6.
That is really all I can say about that








