Someone correct me if i’m wrong here.

Sorry it’s not going to be short and most of the time its approximation.

assumptions Kroos E2 S2M3, the ennemi have 0 armor def:

attack -37.5% aspd —>0.625 s

requirement to activate the x4 hits

0.625*16=10 secondes(total 32 hits), after 10 secondes she will have hitx4 for 20s*

20/0.625= 32 attacks exactly with x4 hits

so in 30 secondes she will hits

32(first requirement)+324(20 secondes of attack x4 hits)

32*5=160 hits

with her talent:

20% of 160% damage and its’s apply only to attacks not hits

number of attacks= 16+32=48 we can hope at least 8 times it is activated within the 30s

so yeah within 30 secondes it’s deadly

On the orther hand

Ash within 4 secondes of stun(the ennemi is not stun immune) she will deal better damage to armored units, she will attack 20 times with 260% damage and after 11 attacks with normal damage(less than 2seconds)

approxitaly 71x her attack in term of damage

Exusiai :

within 15 seconds attacks -0.22 % aspd she will attack 19 times with x5 hits, at least 96 hits but in reality she has her talents (aspd +15, attck +6% and her damage is 110% per hits) so in short shs has more than 96 hits or damage like(lets say 10+15+6 % approximately 125x her damage i will say )

I can imagine within 30 secondes Kroos is better than this two, but there is the duration of the skill.

30s for kroos(can she survive 30 s against a boss?), 15 seconds for exusiai , 6 seconds max for Ash and while kroos il still finishing her skill the other two gain sp to relaunch their skills or finished the target.

In term of dps exusisia activate her skill after 30s but with 15s of duration(1/3 of the time), kroos is a little slower(1/2 of the time), and ash sp cost is 25 (she can almost activate 2nd her skill while kroos finish hers) .

Kroos is not bad but won’t replace Ash or Exu in most of cases, i intend to E2 her but for her S1.

To finish about the def debuff, i prefer the Flat debuff most of the time (Meteorite’s S2(-330), Ifrit’s S2(-300) over the % def except for bosses really heavy armored guys).

And even for regular %def debuff i will use meteor because she has synergy with others snipers.

400-60%= 160 def , 400-300=100def

I hate to read and write my own response but i hope it will help.