How do you get Level 5 Priests?

[Taqwus]

Even normal Ulm gets level-2 priests, but perhaps there's an independent level-1 priest I've not noticed.
As for Charm (or its blood equivalent, Hellbind Heart), if memory serves the range isn't all that great on them, and they are resistable using MR.
Wind Ride was (probably still is) rather expensive to cast -- 20 Air gems or so in Dom I, requires good Air magic as well. It can be blocked using dome spells (can be expensive, not guaranteed), or mitigated by using cheap commanders as spell-fodder. At least in Dom I, I think the victim also gets to know where the Wind Riding mage was, because he gets the battle replay incl. province identification, so it opens up the possibility of retalliation.