|I have yet to meet a MoM player who likes to use Theria The Thief. It's not that she totally sucks or anything, she just happens to have the wrong mix of skills.
Her attack is normal for a low-level hero, but she has no
fighter skills to boost it. No special attacks, no To Hit
modifiers, nothing! The only thing Theria really has
going for her is her agility which grants her a defense of 18
at Demi-God. That's not bad, but without a good attack she
becomes nothing more than a punching bag for bad guys.
As far as her Charmed skill is concerned, who cares? Charmed comes in handy once in every 7-10 battles against opponents, and rarely ever in lairs and nodes. While it does protect Theria from all negative enchantments and spells, it is basically taking up a skill which could have been an attack skill.
Unless you have some special reason to like Theria The Thief, I would suggest you pass her up. Hey, has anybody seen my wallet?...