Drops

Enemies scale in power with the floor they're on. Many enemies appear across all floors from beginning to end. Enemy drops are based on their difficulty, so you are always being rewarded appropriately for the challenge. If Brute Jellies dropped the same items regardless of their power, they would be unrewarding at later levels, and over-rewarding at early levels.

Personally, I think that all Brute Jellies, regardless of their level, should have a chance to drop Brute Cores, but that chance should increase with level. Maybe it already does work this way, but before floor 9, the chance is so low that no one has found one yet.

I've had a brute jelly drop a rocky core and a royal core (5 star) once. I assume all monsters have a certain loot table, but the weaker versions (like a pink jelly compared to a blue jelly) and lower leveled ones have a smaller % drop for the rarer materials. Sure, I have 30+ brute cores, but that was after frolicking through Jelly Farm II for an entire day. It was only at depth 20, so a deeper Jelly Farm II would of come with better loot. I'm also assuming the more people you have in the party, since the monsters get harder and the threat indicator on the bottom right of the mini-map becomes a darker red, the better the loot percentage.

it just drops

It's a 3 star material, so you're likely to find it starting on depth 9. That said, you don't have to actually get to depth 9 to get one. You can save up 5 primal sparks and buy one from Brinks.

y u du dis

There is no point in bumping up such an old thread, so this will now be locked and sunk.