Original sentence: When Eragon and Roran invade Helgrind, and one is killed by Eragon, rendering their species extinct, their parents the Lethrblaka having been slain in the same battle by the dragon, Saphira
Edited sentence: When Eragon and Roran invade Helgrind, one Ra'zac is killed by Roran, and one is killed by Eragon, rendering their species extinct, their parents the Lethrblaka having been slain in the same battle by the dragon, Saphira