Quote Originally Posted by Cobblemaniac View Post
I assume you won't be rushing everyday.

Spend your natural regen BP on union demon experts. they have a decent seed return rate.

Otherwise, gemcha or raid gacha when you're not hardcore farming (recommended you get MVP on most runs tho) can provide seeds too, as will raiding disasters/ catastrophes.
Many top rank unions are likely spending a lot on certain days to focus expert and ultimate. I'll most likely will spend 400~500 seeds for this union event. It would not surprise me if top rank players probably spend 1k or more.

Unless I missed them dropping, envy demon expert doesn't drop seeds. Gem gacha seed rates are no good, if anything they're just additional bonuses when getting R weapons. Lack of gems will become another issue if you're someone who misses most of the 30 minute gem quests.

Raid event gacha seems to be the best source but as mentioned, we're getting an advent then another union event. There is no raid gacha to farm in-between the current union event and the next one. This seems like it'll be a reoccurring theme in the future, as in union then advent the another union.

The quickest way I've managed to find is to buy seeds from the story exchange shop. You can buy 40 seeds per story area so you can get 280 seeds, resets each month. While it's likely not going to make up for the total used for those who spend a hefty amount, it should still help and seems like the most you can gain within a short amount of time.

Of course, if you're someone who barely spends any seeds on union events, then it really doesn't even matter.