Class Experience Penalties

[Danth]

"Or simply that the total xp they need to obtain a certain level is reduced by 10%?"

That would be correct. Experience penalties didn't really exist in the form of a multiplier. Instead, classes simply required more or less experience to level. You're also correct in that a group full of Warriors and Rogues would level quite a bit faster than a group full of Rangers and Shadow Knights.

I do not know how EQ-EMU factors things.

Danth