Executor unlock
I'm quite far from unlocking the executor, but from what I've seen it seems that you'll need 25 months from when you meet the requirements to unlock him if you don't pay for refreshes or buy packs. ...
Forum Discussion
It unlocks at 4 star when you complete the event , then you can do the bonus tier once for free , then 999 crystals per refresh for 10 shards a time. At four star for me it has destroyed Negotiator and Malevolence on offence, but has also been beaten by a Negotiator fleet.on defence.
