Our guess is the current story will play out as follows : Ursula is using Ariels voice to control glimmers to find powerful lore items Flotsam and Jetsam are scouting out to find and steal lore or keep an eye on where the Illumineers are, and get it before them She grows her lair, maybe creating an Illuminary of her own to try to control the realm The Lair is found above ground because of the storms, which draws in glimmers Some glimmers like Eric go missing, and Ursula uses her growing powers to Entangle them and steal even more lore Illumineers notice glimmers and lore are missing so investigate Bruno sees the showdown with Ursula and smashes the tablet, hoping it wont come true The team find the lair and there is a showdown, Ursula loses and retreats under the sea The team then track her down, finding Ursula and her lair have grown hugely powerful A face-off ensues against Ursula and her Entangled glimmers If the team win, the glimmers are freed and the team win something we could guess at but will instead leave to you to find out and keep secret As for the origin story Yen Sid Sorcerer or Curator

When the card 23-117L Chaos is not included in the deck, these restrictions do not apply
You want to use your removal spells to keep your opponents off their big threats
You can't wait to play it later in the turn
This can help stall an opponent so the player can take full advantage and win, pull ahead, or come back in the game