Are these couple of sentences properly worded?

FYI- Alegni is the Netherese warlord. Barrabus had no hope for freedom except to kill Alegni or destroy Charon’s Claw, which he could not do as long as the Netherese warlord wielded the blade. Shortly thereafter, the Thayans used a small force of umber hulks serving the Abolethic Sovereignty for a subterranean assault on Neverwinter.