The Abaddon starts out with constant NulAll and Auto-Reflect, making magic useless. The Abaddon uses Pharaoh's Curse to inflict Darkness (150% chance), Silence (150% chance), Poison (130% chance) and Curse to a single character. Finally, it uses Emblem of the Cosmos, which does heavy damage to all characters, as its ultimate attack.
His Demi attack reduces current HP of target party by 1/4.
Abaddon drops weapons with Magic +% abilities and armor with Magic Defense +% abilities, the +20% versions of these being fixed.
The best option is using the Celestial Weapons for defeating him.
Cast Hastega and attack with Quick Hit. Don't bother with magic, because it has constant NulAll, Reflect, and other protective statuses in place. Abadon tends to use Pharoah's Curse more than anything, though, so either have Darkproof, Poisonproof, and Curseproof in the armor will be useful.
abaddon appears in the Bible as a place of destruction and an angel, respectively. In the Hebrew Bible, abaddon is used with reference to a bottomless pit, often appearing alongside the place שאול (sheol), meaning the land of the dead.The Hebrew term