Does +Cha effect only Charm, or Mez also?

[nicemace]

yes it helps mez, how much? meh dunno really.

it only helps on resist chances for spells like mez, charm, lull. example, you charm something, it helps with the resist checks while still charmed etc.

it does help with agro from resists on lull. aka more cha = less chance of agro from resist.

and PLEASE note: mez is a fixed duration spell, it CAN NOT break early unless broken by a player/pet. ive seen too many bad enchs say 'omg my mez sucks cause of my bad cha'

if you dont plan on ever charming / effectively lulling... then its perfectly viable to play a ench without needing to worry about cha.