If you read the "Adventure to the New Land" TLH fanfic of mine.
Then you must be heard about Lily's magical necklace, right?
My headcanon of Lily's possessed object in this AU was necklace. But why? And how she could have gotten a thing like that? I'll tell you...
You're know its ability already, aren't you?
It can create a blue invisible platform/limited-size shield to prevent and protect someone that user/(current user is) Lily wants. However, it really needs her health for the exchange, produce energy to the necklace power then creating a platform or shield. And vice versa, if she runs out of endurance; her power may getting lower by time, and cannot create any platforms and shield.
It was supposed to appear at the end of the first fanfic in the timeline of Doraemon AU. Which meant she got it before "Adventure to the New Land" event. But I will make that one the last.
(Check my profile account that have information about me, what I do now and you'll find the timelines I put there.)
Welp, there's nothing more I can do, so... I guess I could describe her necklace here.
The necklace has chain surround and in the middle is an unknown orgin material that had shield-shaped. The chain was made from platinum. The material's outline is looked like real gold. Inside is a purple-colored glass, and inner the glass surface is another "special object". The "special object" inside the glass surface is a gem lookalike, it has light blue like Lori's symbolic color.
When you read chapter 2 and on. You may not see the part where Lisa tried to explain how Lily got it. That's simple, because I don't want to spoil the story for you. And the whole family had heard the reason why the youngest Loud possessed it.
Wait until that story comes out and you gonna know every exactly single happen.