You should be by now, if you have farmed proper ships for the challenge.
You will need 5 dark side non—capital ships at min. 4* to get Executrix to 5*. Then you need any 8 non—capital ships at min. 5* for the challenge itself. Apart from that you can buy them in fleet shop or receive them in guild events.
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You will need 5 dark side non—capital ships at min. 4* to get Executrix to 5*. Then you need any 8 non—capital ships at min. 5* for the challenge itself. Apart from that you can buy them in fleet shop or receive them in guild events.