On top of all that, be generally aware that sometimes some lore confirmation can come from weird obscure interviews. It's usually not entirely new info (or necessarily important info) and more just confirming things that the game implied anyway, but I know that 'there's degrees of tempering and the Heaven's Ward were lightly tempered' comes from a Japanese-language interview, and the confirmation of where Ran'jit was from came in a Q&A at Gamescom.

I'd generally advise that if anyone ever produces something you haven't heard before, ask them for a source. This is useful both for you and them; for you it expands your knowledge of where to look, since goddamn anything could have lore in it, and for them it can often help to refresh their memory or review misconceptions. A funny thing about lore in a game like this is that someone who's really into a specific subject can actually be a pretty shaky source--chances are they've done it quite a while ago, and since then have often gotten pretty deep into speculation, personal fanon, and various bits of fan-content and speculation to the point where they start having trouble telling where stated fact ends and personal interpretation begins. I myself for example, off-and-on Summoner main since 2016! And a PRETTY BAD person to ask about Summoner lore, because that means I last did Summoner's storyline six years ago.