1. ML Luluca S1 SB can one shot ML Tsurin if the damage is enough.
2. Alexa S1 if she has enough damage.(haven't tested but assume it is like ML Luluca S1 SB)
3. Charles and Alencia's S1 double attack procs if they have enough damage.
4. Situations where the other unit can counter and has enough defense/damage reduction to stop Tsurin from getting back enough HP.
5. Like number 3. Evasion causing misses reducing her damage not allowing her to lifesteal enough.

Ultimately in a 1v1 many other units can accomplish never dieing also. She is definitely strong and hard to deal with though.

Ok thanks,I have her and she was warming the bench for a while but recently I saw some videos how annoying she can be

counterattacks / extra attacks are pretty scary for her. In a recent RTA match, T. Surin of the opponent died from a counterattack + DD proc of my Kayron. She is most annoying when combined with F. Ceci (aurius), Roana, Livesteel set.

She can be easily countered since the beginning.

You can one shot T.Surin by:

Extra attack (Basically any high damage rogue w/ Dust Devil; Or skill trigger like Alencia S1->S2)

Dual attack

Extra damage (Tooth, Drink, BW.Iseria)

6. Sigrets s2 

7. Also by an unit that can get extra turns with souls

I countered T.Surin by placing a counter set A.Ravi.

It was a fun realization knowing that finding a good usecase for A.Ravi is hard. Lol.

Nerf tsurin, remove the swift defense from her skill please smilegate