Translation:Kahless and Lukara killed Molor's soldiers.
When two nouns or two sentences are joined together with a conjunction such as "and, or, but", this course expects you to translate them in the same order.
See also the announcement at https://www.duolingo.com/comment/26690359 .
Sometimes switching the order makes no effective difference, e.g. "Tom and Paul each bought a book" has pretty much the same effect as "Paul and Tom each bought a book". Sometimes it does, e.g. "He fell and broke his wrist" is not the same as "He broke his wrist and fell".
On the other hand, "Paul bought this book" describes the same situation as "This book was bought by Paul" -- but those two sentences look rather different and I would not expect both to be accepted as translations of the same sentence.
Long story short: keep the order the same.