in most cases 4 archers or mages will work fine.. however some duties like the level 50 duties, especially late story ones may required 1 healer as a minimum.
The party makeup is entirely your decision tho.
All profiles should complete regardless of the party makeup but no healer may mean more deaths.
Trials where players dont Respawn will require a healer or you may end up in a continued death cycle wiping and restarting over and over.
Ramuh, requires a healer and a skill profile for that duty
Shiva requires a tank and healer/s
The party makeup is entirely your decision tho.
All profiles should complete regardless of the party makeup but no healer may mean more deaths.
Trials where players dont Respawn will require a healer or you may end up in a continued death cycle wiping and restarting over and over.
Ramuh, requires a healer and a skill profile for that duty
Shiva requires a tank and healer/s