I use her under a ZTalzin lead as a paper sister. I purposely didn’t gear or mod her too high. She dies easily, boosting Asajj. But when she does hit, she heals. I almost never use her healing second ability. Her mods have health, offense and crit avoidance. I’m At 468 in arena.
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She may be support but can hit like an attacker
Edit:
Oh! Arena? Focus on speed as well. Talia's strength is, that she can remove debuffs.