[Jarkko]

SOP = Standard Operating Procedure

Black Bow of Botulf requires a hit to cause feeblemind, you don't have to actually deal any damage to cause the feeblemind. After the target is feebleminded it gets -5 Magic Resistance (if the Grendelkin has no MR equipment, this means MR drops to 13), which means the Soul Slay from Ethereal Crossbow is very likely to succeed. If in doubt, use a Vinebow or cast Vinearrow etc to make the target stuck in place.