Valkyrie Randgris is really a big problem for a DB or Hybrid RK when it comes to solo Endless Tower
i have seen several videos including Crosscy‘s,and i made several status&equipment build attemp
fanally i came to the conclusion:even with +14Lindy,only u have a Mot or Gloom card,u can smoothly one-shoot kill Valkyrie Randgris using Crush Strike
use Mob scarf&TempLuck or DWings&Dboots or 120Int with a Seraphim make really tiny difference in damage
it comes to 2.3m at most(when i tried,i didn't use shadow gears and damage was 2m around,no double attack),but Valkyrie Hp is about 3.2m
sure u can use a +9Battle Surcoat hoping for a double attack,but it‘s really uncontrollable
when there is no double attack,here is the scene:
u die and u try to stand up for a new round,but Valkyrie Randgris flying here and there like she is dancing around ur body
then u pick a chance to get up and ready for a next try,she say "Hello" to u and use a Dispell,then u die and repeat again or u lucky survive and most buffs disappear,take a deep breath and try again
i mean it really feels bad when u can't one-shoot kill Valkyrie
so buy a Mot/Gloom,maybe u get both of them,u can still kill Valkyrie when she says "Hello"