Astra: Knights of Veda - Portrait of Thierry Floor 18 | F0 Death Crown still strong enough

I probably need a elemental overload battery.
All my Knights can be seen at the end of the video (no Aurora, no Sorin, no F6 5*). DC skills are lvl 8/9/9 and he needs a better ring (using Ancient Ring atm). His Legendary Halo was lvl 20 and the Epic El Cid used was lvl 40.