Today i spent 2 keys for the final mission of 100m damage to clanboss, i used quickbattle and average around 80-85m per key. After using both keys mission wasn't completed, i did quickbattle because it did complete the previous mission doing damage to nightmare clanboss.
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UPDATE:
It's just not working on UNM, even when i don't use quickbattle it doesn't count up, did 1 key on NM again and it counted. wasted 4 keys on this!
This should be fine as long as you start and do the damage required on one difficulty. Have you been trying that to no avail?
when i finished my 1st key on UNM it did not count in the meter to 100m, since i was quick battling i thought i'd try manual, still did not count towards 100m in the arbiter mission. Then when i went to NM and did my quickbattle it did count up to the 100m mark. So in my opinion it just did not count the UNM runs, eventhough i started my mission on UNM and not NM.
