The rune altar is a magical object, presumably created by Circle mages to summon rune warriors.
Description and using Edit
The rune altar looks like a white circle in which 1\3 of wall is absent. In the center of the solid wall there are two statues of rune warriors, apparently. They depicts male and female humans: the man is a warrior in armor, helmet and with a sword, and the woman holds a staff and wears a healer's robe. When a rune warrior is going to be summoned, eyes of statues are glowing with green-blue lights. The rune warrior appears from nowhere in the center of the circle with a bright flash.