The Drahk aren't a multiple race and the Shadows weren't energy based beings, they could be killed with energy weapons or PPGs.
the Drahk certainly seemed
like a multiple-race society, in that there were at least three kinds of Drahk i can remember:
the "ambassador" who met Delenn, and was all time-shifty;
the standard drahk including the dude who put the keeper on Londo;
and that red-eye "count-dracula" looking drahk who seemed like a leader or some such - from crusade maybe?