QUOTE(Jim Houseman @ Apr 18 2022, 23:49)

This is my first easter event which i joined (i mean... i always missed this events so far. sadly in my country easter is not so known event. fortunately i finally could realize that there's the event yesterday...), so let me ask a bit please.
1. how would those cores after event? can i keep some at hand, as memories of this event ? or it would just vanish after event?
2. what should i do exactly? i anyway found 6 variety of core items and offered each items to the snowflake shrine at least once. can i think that i'm in bonus stage now? or is there anything i should have to do yet?
Thank you guys, and a happy easter.
1) You can keep as many as you want, they won't disappear, ever.
Other than keeping them you can trade them in to get the items from shrine or sold them to other people in the future when someone want them for collection.
2) You just have to trade in a single item of each type before the event end, stop.
For every one of the six types of artifact that you shrine you will get a special Level 7 Trophy.
If you hand in all types vefore the event end you also get a Level 8 Unique Trophy.