Braum

Additionally to the information about Braum we get in his Bio and Short story, this is what we know:

Braum's shield is a door that was forged by Ornn[1] and enchanted by Lissandra[2].

Note to [1]: It is chapter IV.

Note to [2]: "The Ice Witch had cursed it" The only Ice Witch we know about is Lissandra. Technically, this one is not confirmed.