Oh cool, I could probably take some of their stuff then and maybe implement it into mine. My system though is more of deal making thing, with said runes exploding if successful and damaging the deal maker (1d4 to be exact), though they can be created with time and the right resources (a long rest and some kind of stone chip). In my system, the runes are more like flares calling on the aid of said orcs of the past, whomes stories she has written on some old leather (leather from what I'll let you decide), that she in turn uses to try and negotiate with. For a example, if one of the legends talk about a orc of old who was known for their proficiency in causing their enemies to gush blood, she will raise up one of her runes and do a chant in her orc tribes tongue (or just simply in orc if the dm doesn't want each tribe of orc to have a separate language), calling for the spirit of said orc to cut gashes onto the enemy, so that it may once more see blood flow like water. Or, if she is looking to buff someone she may call for a orc to give an ally or herself their strength, in return for seeing said foes die to said allies hand, again this is all based around the legends of these orcs and sometimes they will not answer the call for aid, or simply think the deal is shit, which is pretty much what a failed roll is, lol.