Well if so, that's easy. Malicia/Abishai are both Devils, Lawful Evil Outsiders.

Malicia is a *bit* special, as are other succubi. I go into detail about them in this forum post. Abishai are fairly straightforward devils.

Long story short - the +5 Holy Burst Silver of GLOB that you craft to fight Horoth/Arraetrikos/Suulomades will be equally as effective against Abishai/Malicia, as well.