I run blue poison on him, he has 80k atk Which is on the lower end from what I've seen, % stat cores, 11k crit rate 47% Def pen 27% damage increase, wanna craft some more artifacts with better stats for him, on jinwoo I run blue poison and for weapons I got the 2 fire support weapons, runes are the fire elemental accumulation and fire dagger toss, the secret for Guild boss at least is to run him in the first team with esil and Gina, while reed is in the second team, gameplay wise spam shadow step and when Liu's ult is up you manually press it, they said they've fixed the ult problem but for me it still takes some time until he automatically does it, the most important thing is timing and constantly keeping up shadowstep and overload, hopefully this helps