Dawn was the second mission I did on LASO in Halo 4. The biggest problem is keeping your shields up so you can successfully engage all the Elites in melee Combat. I had a hell of a time in previous attempts dealing with the second Elite in the Observation Deck – he would run around, always be aware and whenever I tried to EMP him he would kill me so fast! This time, I got really lucky and he went on the perfect cycle really quickly. In Co-op LASO that bit is super simple since you can take one each, of course. If you hate tricks, this is probably the 2nd easiest (after Shutdown). But if you like tricks, then Reclaimer is easier.
Halo 4 Dawn LASO in 14:23 by RC Master