DPSx1
SP elemWater
PSP Primary — obligatory.

Talk to the Airship Captain in Cylloan. Requires Fernon Raid Seals (achievement 'Elite Unknown Souls' grants 25 seals, mob drops in Unknown Land, or Act 6.2 mini-bosses with 50% drop). Public warp with a gold cost is also available.
Incomplete Fernon gains a different buff every 60s. Every 10-15s two swords spawn and must be picked up within 10s to grant team buffs and/or debuff the boss.
PSP Primary — obligatory.
PSP Secondary — obligatory.
PSP Elemental — obligatory.
No hard requirements.
Lever (also counts as 1 of 3 debuffers).
Debuffer BA (2 additional; lever counts as 3rd).