Why Annihilation? I’ve tested it out before and it DEFINITELY does not work, in fact, it’s counter intuitive. I’m pushed out of range 1-2 enough already. Mercy is for SeraphBlade/Dual Annihilations abusers and for getting out of sticky situations, too. It also has higher average damage than Annihilation. Later on, NightEagle will most likely be replaced by another NightFall.
Btw, I just mythed my Zarkares.
Personally, I see Mercy is better than Annihilation (in my situation). I’ve seen enough of these mechs get murdered by people who stay at range 1.