MaxHP -44%.
Each time a monster is killed by melee physical attacks, recover HP amount of 200 + (10 * refine level of the compounded equipment).
Drain 4444 HP as the armor is unequipped.
[ +Grudge of Royal Knight Card ]
Increase resistance against Neutral property attack by 20%.
FLEE +20
Drains 100 HP each 6 seconds.
Drains 6 SP each 6 seconds.

[iRO Description]
MHP -44%
If a Melee Physical attack finishes a monster, HP +200. (Additional HP +10 every Upgrade level)
-4,444 HP when unequipped.
Neutral Resistance +20%, FLEE +20, HP -100 and SP -6 every 6 seconds when equipped with Undead Knight (F) Card.
Class: Card
Compound on: Armor

More Information on Combo:

• Agony Of Royal Knight Card & Grudge of Royal Knight Card