Brutally boring.
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Castrum is pretty good too. I love both of them. I haven't tried DR Savage yet but it looks pretty amazing as well.
I'm not a big fan of the Southern Front i liked the Eureka zones a lot more. Biggest issue I've had with relic is the second stage of 36 memories. Hasn't been fun taking my main and alts through that step. I'm hoping they'll further nerf the drop rate with 5.55 for those memories.
Lost Actions / Essences.
If you care about the storyline, you gotta rank up, do castrum lacus litore once, then do delubrum reginae once. There will be a Castrum Lacus Litore like dungeon in Zandor, the next zone as well. Completing a relic is actually 100% optional so far.
If you don't care about the story or the relic, there's not really any point to doing bozja.