Are you familiar with Schlock Mercenary? It is a web comic (that has concluded) which features dark matter entities in a later story arc. There isn't much in th

Are you familiar with Schlock Mercenary? It is a web comic (that has concluded) which features dark matter entities in a later story arc. There isn't much in the way of direct character interaction except through warfare because there is a tech that baryonic matter civilizations find very convenient that makes space uninhabitable for the dark matter creatures, and conversely those creatures can cause stars to blow up. Very interesting stuff, starts out much smaller scale than all that though.