It represents death and the lives lost because of what the Renans have taken away from the Dahnans.

[Dohalim's gaze is on the Master Core set aside before relaxing ever so slightly against Zhongli again. what hopes could be held in such a thing that had brought them so much pain? he's felt the astral energy that's contained within, he's felt it course through his veins. he's felt the corruption try to tap into it, try to gain control of it, but only coming up short of succeeding. save for one instance, the one moment that Dohalim fears could happen again if he were to let all of this fester, and if he were to keep it in his possession, he's scared of what he could do if he lets himself slip completely. and with his contract with Zhongli...]

I used it, once. I felt it... I felt this unimaginable power... But I don't want it. I don't want to use it again. I don't want to use this power to hurt anyone again. To hurt you.

[he's already done that enough]