I thought I had this bookmarked but apparently I don't.

There's a Google Spreadsheet out there somewhere that tells you what loot challengers drop when. I've found it helpful in the past to know how beneficial it is to keep battling an opponent.

I can't find it now, and I've tried looking at the top/most logical posts, but I'm not sure what it would be called exactly. Can someone help me out please?

1P Loot tracker - Collaboration Project? it's listed in the first post of the battle chat under user-run resources, but i think 's spreadsheet (also listed in the first post) includes loot too

Yes, that was it! Thank you. :)