[Dolalin]

Actually according to this in-era Enchanter guide I just found, Mesmerization's max capacity was 5 ('including yourself', which is a little vague...):

AoE Mez
Mesmerization (16)

One of the most powerful contenders in the crowd control arsenal--if used correctly. Also extremely dangerous, much like charm--and many times an aquired taste among enchanters. This is basically a level 4 Mesmerize (24 seconds), with a 5 target capacity--including yourself. While the short duration requires a bit of casting to maintain, a well-placed AoE Mez can lock down an incoming train rushing a caster/healer... when you just can't afford the time required to single-mez mobs. If 4 mobs jump a tank--single mezzing and perhaps a bit of PB stunning will do just nicely, and be much safer. When a train adds and rushes the cleric? Well you'll get one--maybe two--of them mezzed before the healer is juice on the wall. AoE Mez cannot be overwritten by single-mez, meaning that you either stay committed to refreshing AoE Mez often (and single-mez resists as they break free)--which isn't bad as 70 mana comes back quickly as you get high enough that you need to AoE Mez with frequency, or utilize charms and roots to set up the mobs for a switchover to single-mez. You can charm an AoE mezzed mob, then renew your AoE, and of course your pet will not be affected. Learning the right time to AoE (not around higher level mobs that resist too much) is the true discipline required to master this power. This is a spell that should always be ready to cast if there is a possibility of being trained, even though it may go the whole night without seeing a single casting. Also important, is to raise you MR as high as you can, to minimize the chance of mezzing yourself if you stand too close to the target the effect will radiate from. 100+ MR leaves the chance of mezzing yourself extremely slim.

http://web.archive.org/web/200110072...ells/spell.htm