I had her +20 A path at one point. Her tile damage boost was legit.
Talking base model, no emblems, here are my main beefs (probably stated above somewhere too):
The damage from her special is irrelevant. In that context think of her like Hu Tao, Justice, or Li Xiu. You’re firing for secondary effects, not to inflict meaningful damage. She can reduce more health than she does damage … it’s really not great. I will say unlike those heroes her tile damage is great.
Her HP drop is somewhat of a red herring. It is a nice perk for sure. There is no downside to having it. It is just there to amplify her real use which is 50% reduction to healing. See math above in thread.
Her 50% reduction to healing is a great power and gets multiplied by the reduced HP mentioned above. The problem lies in the use. In provinces, and even quests, most bosses don’t heal. Where you run into healers is in raids and PvP scenarios. The issue with that is she is not for D as her special is best with precise timing. On offense it can be useful, but the timing factor can hurt because her survivability is very low.
You can make an argument if an enemy team had enough healers to warrant her she isn’t at great risk of receiving a lot of damage. Conversely even slash attacks at diamond level from emblemed heroes leave their mark on her. You could try going all HP/D with talents to balance this, but I think her stats start so slow it doesn’t help enough to warrant the cost. That’s why I reset and went A path because her biggest asset is tile damage which she doesn’t need to be alive for.
Truthfully the potential is there. I think she should have had her stats tweaked for high HP/D and low attack a la Gormek or something. Her special can wreak havoc with multiples copies of her, but the survivability is haunting you again. You could try building a team based around added protection to her, but I would question if her benefit in general warrants specializing other slots on your team to keeping her alive.
This is all end game standpoint. She is useful coming up into platinum. By diamond and hard stages, etc she is relatively out classed. This is somewhat natural as a 4* though, she is not alone in this. I think the problem of perception comes in with her being S3 you need to be so far along to even get her. It is also difficult compared to some of the monster 4’s S3 had: Gullinbursti, Mist, Brynhild, etc.
That being said at end game stages you have a surplus (typically) of 3* mats. You’re also typically waiting on 4* mats ( ), so you gotta do something and maxing a 4* is pretty inexpensive way to pass time.
I like she is unique, I like her special is unique, her A value is great. I do not regret maxing her. Her base stats are inappropriate for the character IMO in original design and she can’t really hang past mid platinum because of that.
Finally, shout out to @Kalis as I would be bereft to not mention that the Poisoner of Whatever town doesn’t actually poison …
She could be tweaked with a stat alignment, but SH has a poor track record of such things with 4*’s. The focus is typically 5*’s with adjustments. I won’t go there in terms of S3 costumes . Some people say increase her mana speed. I think that would help mitigate the risk of using her to an extent, but the true error lies in her base stat arrangement. A thought could also be make her effect healing reduction uncleansable and maybe longer duration like 5 turns a la Khagan.
Done rambling for now … sorry.