Runeterra Spirit Blossom Festival Quests

Just in case someone wants to know all the requirements for the special Spirit Blossom Festival event quests in advance, here they are.

Epic Quests (10 or 15 Petals)

1. Bandlescout's Code (15 Petals + Icon)
   
   • Deal non-combat damage (0/100)  AND
   • Strike your opponent's Nexus (0/50)
2. The Collector of Souls (15 Petals + Icon)
   
   • Kill 2+ enemy Units in a turn (0/20)  AND
   • Challenge Units (0/100)
3. Chase the Wind (10 Petals + Emote)
   
   • Stun, Frostbite, or Recall Units (0/90)  OR
   • Win games in Expeditions (0/15)
4. Teachings of the Dragon (15 Petals + Icon)
   
   • Cast 2+ Spells in the same Round (0/40) AND
   • Play cards that were not in your starting deck (0/50)

Event Questline (4 or 7 Petals)

1. Spirit of Temptation (4 Petals)
   • Win games in Labs (0/4)  OR
   • Win games in Gauntlets or Ranked (0/4)
2. Spirit of Loss (4 Petals)
   • Toss cards (0/40)  OR
   • Kill enemy Champions (0/5)
3. Spirit of Despair (4 Petals)
   • Win a game at 5 or less Health (0/1)  OR
   • Attack with at least 4 Units in the same attack (0/10)
4. Spirit of Hate (4 Petals)
   • Kill enemy Units in combat (0/20)  OR
   • Target the weakest enemy (0/10)
5. Spirit of Obsession (7 Petals)
   • Cast the same card 2+ times (0/5)  OR
   • Target the same ally 2+ times (0/10)
6. Spirit of Death (7 Petals)
   • See Last Breath triggers (0/40)  OR
   • Play Fleeting cards or summon Ephemeral Units (0/40)
7. Spirit of Nature (7 Petals)
   • Plant Mushrooms (0/250)  OR
   • Summon Elnuks, Poros, or Spiders (0/40)
8. Spirit of Salvation (7 Petals)
   • Support your Units (0/15)  OR
   • Allied Units survive damage (0/30)
9. Spirit of Reflection (7 Petals)
   • Give Units Barrier (0/30)  OR
   • Play Units with equal Attack and Health (0/30)
10. Spirit of Heroism (7 Petals)
    • Level Up your Champions (0/10)  OR
    • Attack with Units that cost 3 or less (0/40)

Quote From Phaseshifter

What does "Upgrade" do in the event?

 

I'm afraid to click it because it feels like I'll be wasting something.

https://imgur.com/LqcRBKC

Haven't clicked it but it should take you to a page where you can buy the event pass (or whatever they called it) and thus gain access to all the rewards on the event tab.