If you want to make sense of some items, you will need to search League's lore and make appropriate connections. For example,
does not draw much attention until you remember that well before the present time Lissandra was once called the "Seeker", in addition to it presently being worn by Sejuani. Likewise, nothing is explicitly given of
's history, but it is quite likely it belongs to
or one of her previous incarnations, as few match the title of Frost Queen as well as she does.
Perhaps the best example is
. It has absolutely no lore written about it, but you cannot discuss the Shadow Isles without mentioning the Ruined King. Champion interactions with some of the more recently released characters also sheds some light on certain items, and is a new avenue for item lore. To continue the example,
has a great deal to say when purchasing the Blade of the Ruined King.
"Once, he was a noble king, until grief overcame his reason."
"In the end, it was not his blade that stole our lives."
"As once it symbolized hope, so now shall it incite despair!"
Some stories are nice to speculate on, especially the support trio of
and
. I like to imagine that
was once the shield of a trainee, an initiate's shield long since discarded.
is possibly the former trainee's shield as a proper soldier of the Rakkor. Finally,
exemplifies their rise to legend by performing an exceptional feat, christening him or her the "Face of the Mountain", a nameless soldier who, like the stony visage of Mount Targon, could not be moved, even when confronted with impossible odds.
As for if any of it is retconned, I doubt it. Riot has more or less stated that anything which does not directly conflict with current or future lore is canon.