FYI he is not playing a DPS class.
Jace is a support Linker c3 which requires partners with high STR and high DEX to optimize his Umbilical Cord. And that’s what he did with his party. Full STR Fletcher with Isbality +10 and critical gems combined with a DEX focused Dragoon partner will secure most world boss cubes.
Tips & insight :
Dullahan usually spawns the next 2 hours after it died (if it’s not bugged). So if you camp Dullahan 20 hours a day, at least you can get 20 cubes a day from Dullahan that spawns at channel 1 and 2. 5 straight days camping Dullahan will give you 100 cubes.
Maybe I’m just ignorant or noob or something, but so far I haven’t found any sign to tick that “Neutral” option in my guild UI nor guild tower. Otherwise, the current guild wars that are currently happening in Klaipeda server won’t ever happen.