I was thinking in a World BOSS.

I mean a BOSS that have like 999m+HP And have a duration of 2 Days(Respawn every 4 Days)

Every person can create a room with 3 friends and try to damage him.(If they do 55k dmg, the BOSS gets 999m-55k=998m, something like that).

Or can be a Queque, aleatory Characters.

And u can have a reward based on the amount of damage u did.

Something like...

1st Place:20 Platinum(if its possible)/A Full Stat Awaked Relic or something like that
2nd Place:10 Platinum/Semi Full Stat Awaked Relic.

There can be a Guild Reward too

Etc etc etc

What u guys think?