That's hard because of two reasons: 1. We don't know your line up, except for the element. So we don't know what's "hard". Boss could be hard due to a bad debuff (like Medusa) then any team without affliction removal is bad news, or boss could be hard due to tankiness (like Phoenix) so any team without serious dps is hopeless, or boss could be hard due to high damage (like Ixion) then any glass-cannon team is, well, glass. 2. To accurately answer your question, the person has to meticulously comb through all upcoming advent bosses Ragnarok mode 1 by 1, which takes time and also challenging due to Google mis-translate. So YOU are the best person to do this instead, and the link is here