During a challenge, you must collect all the Phantasmal Seeds and return to the Phantasmal Gate within the time limit. If you are hit by attacks from opponents during this time, the time allotted to you for the challenge will decrease...

After you have entered the Phantasmal Gate, certain special Dream Flowers will appear. Standing within the barrier that these flowers project will cause opponents to forget your existence and allow you exit combat. Additionally, activating these Dream Flowers with Electro will allow them to mark the location of the remaining Phantasmal Seeds for you, but this will also undo the effect of the barrier.