To be fair, the last sentence in GP comment makes it fairly obvious they're just trying to understand the context in which this applies.
"Lootboxes" means different things to digfer people, depending on their experience with the genre, even if those that have been following along think of it as "pay for random item roll", as I believe is the case here.
They boost the chance of getting rare loot in dungeons and possibly (no confirmation without posted loot table odds) some items can only ever be acquired with the boost active. It's loot boxes with more steps.
"Lootboxes" means different things to digfer people, depending on their experience with the genre, even if those that have been following along think of it as "pay for random item roll", as I believe is the case here.