Cursed Knight's Shield combination method is explained in this Combination Scroll.

[Required materials]
Shining Spear Edge 50 ea.
Zelunium 30 ea.

[Cursed Knight's Shield(1)]
A knight's shield that was carried by Cursed Knight.
If you clean the curse, you can obtain more power from it.

ATK +3%, MATK +3%. Reduces after attack delay by 10% (ASPD +10%).
Reduces damage taken from all elemental monsters by 7%.
Has a chance to restore 25 SP per second for 5 seconds when receiving physical attack.
Has a chance to restore 150 HP per second for 5 seconds when dealing physical or magical attack.

Refine Level +7: ATK +10, MATK +10.
Refine Level +9: ASPD +1.
Refine Level +12: Reduces after skill delay by 3%.