Dranurian Deiasmaar

The Dranurian Deiasmaar is a traditional alliance or pact of mutual aid that may be sworn between the various kingdoms of Dranuria in times of need, usually to confront some larger outside threat that overshadows any of the typical quarreling among them. As long as the Deiasmaar is in effect, the kings of Dranuria swear not to make war on each other, and to come together against whatever greater peril confronts them, cooperating and aiding each other in any way required without reservation. The term comes from the old Tuvai roots “deia-” or “deya-” (which can mean fruitful, beneficial, bountiful, or helpful; cf. Deinoa) and “samar” or “samhar” (meaning a contract or mutual agreement); it is perhaps best translated as “an agreement of mutual benefit” or “a pact of shared aid.”
Most recently, the Deiasmaar was convened in response to the invasions of Gol Garga. Previously, the Deiasmaar has been convened by Dranurian rulers for occasions such as major wars against the Kelimarian sultanate (e.g. over control of Ojaum, such as in the 1170s - 1180s CV after the death of Shekondar and irreconcilable disputes over the wyrm's huge hoard), to repel attempted conquests of their lands by the Phyridian Empire, and to attempt their own permanent conquest of Varadeska. 
The Deiasmaar has also been convened opportunistically by particularly strong Dranurian rulers as a pretext to bring all the region’s kingdoms together under their control. At various points in history, this has resulted in Dranuria being unified in a de facto single large realm under what is effectively an over-king or high king. The duration of these arrangements has varied from months to decades, but they have all eventually fallen apart. The other Dranurian kings naturally resent being dominated by one of their peers under the pretext of the Deiasmaar, and will break out of such an unwelcome “alliance” at the earliest opportunity.