Flying Kick DMG

Can someone tell me how to calculate the damage on a Bonespur Talisman and the like? Is (the 5 extradmgamt) directly added onto the min. damage at level? Is it added after, like a damage bonus? Is it added as would be a bane damage? or some other way? Is there a check against mitigation and/or avoidance? I can't seem to find a calculation method anywhere on the net. Please show your actual formula if you would. Thank you very much in advance.

Edited, Sat Dec 3 06:35:41 2005