
Originally Posted by
Corintis
As you've mentioned, those free 5* Knights (and their skill/equipment blooms) should be your top priority, so that's Gentian and Lavender. And again, those manyus are probably your next priority. Ampys technically help better in the long run, but we're talking about the REALLY long run here, and you'll have a million chances to get them in the future. But if you have enough leftover, splurge on them.
Generally, as a new player, you should prioritize upgrading all your 4* and above knights first; 3* and below get replaced relatively quickly. Ampys should be used typically on a 5* knight or above, but mainly because they'll always have a place on your team. Feel free to give it to your waifu, who's claimed a permanent residence in your team (mine's Waterlily).