The following are the Atma I use.
  • DD/tank (with healer/support): RR/GH/Apoc
  • Solo (Nighttime/General): RR/GH/MC
  • Solo (Daytime, if needed): RR/GH/SD (slower but safer than the above)
    Note: Solo includes farming, NMs and quests.
  • Skillup (defensive): Vic/SH/MC
  • WS points: MC/VV/SD
  • AoE/brew: Beyond/Gales/Ult
    or: Ult/Gales/Hell (which most people probably don't have though)

Atma of the...
RR: Razed Ruins
SS: Sanguine Scythe
GH: Gnarled Horn
MC: Mounted Champion
VC: Vicissitude
SH: Stronghold
SD: Sea Daughter
VV: Voracious Violet
Beyond: Beyond
Gales: Gales
Ult: Ultimate
Hell: Hell's Guardian
Apoc: Apocalypse