Bought premium, no quest added but I’ll give it a minute.
So the rate which we earn the disc currency isn’t disclosed basically, but just play and they will come.
In addition to the one time quests you'll get during the event you have the RISE UP (REPEATABLE) Quest that awards 3 discs each time (for 3 pvp wins or 6 AI wins), plus the daily first PvP win bonus you can see at the top your quest list.
SHURIMAN EXPEDITION is the bonus quest you'll see.
Riot_DanCast
In addition to the one time quests you'll get during the event you have the RISE UP (REPEATABLE) Quest that awards 3 discs each time (for 3 pvp wins or 6 AI wins), plus the daily first PvP win bonus you can see at the top your quest list.
SHURIMAN EXPEDITION is the bonus quest you'll see.