My first event I was able to do I wasn't able to finish. I think most of the player base won't be able to finish this one.
Do you have any of these from which to gather? Recent events gave characters that can drop it like Coral the Octomaid, Prince Zahid, Philomena purple centaur, Kang the panda, Deep sea kelpie and Dutchess Winifred. If so you may even have a couple in your inventory. I think it may be possible to get from an adventure also. But, this is a really hard event. I really want to finish the portal more than anything and don't think I'll be able to.
Light armor from Inventory list
Crafted: magic forge
Found: Knights Hall, dragon, Adult Bijou Dragon, Adult Flare Dragon, Adult Matrix Dragon, Destrier, Rouncey, Horse Track, Dragon Bones (Baron's tent prize), Fireworks Dragon (Baron's tent), Faerie Dragon, Fire Fox, Troll training grounds, Armored Alicorn, Armored Manticore, Jousting Steed, Spring Dragon, Aquamarine Dragon (Baron's Tent), Dark Knight's Steed, Light Knight's Steed, Glimmer Dragon, Dark Onyx Dragon, Armored flyger, ghost knight, shattered wyvern, scorched wyvern, Mothraki Knight, Interpret the Knight (mystic card), Silver fae dragon, Tide Dragon, Plush Prince + Princess, Aquatic Dragon, Aquatic Wyvern, Dark Wyvern, Armor stand, Armored Lion, Sleeping Dragon, Dark Wolf, Armored Black Bear, Renata, Royal Siren, Armored Widow, Flying monkey, Bengal Tiger, Mushroom Fortress, Kitty Knight, Mantis, Glimmergras Dragon, Delsin, Iguana, Armored Lizard, Flight Lesson Dragon, Coral the Octomaid, Tropical Dragon, Armida, Prince Zahid, Sherbet Dragon, German Shepherd, Philomena, Kang, Deep Sea Kelpie, Duchess Winifred, Marquis, Martin