I use theri to gather wood and fiber, then craft primitive bows at 10xp eaxh and feed them to my gachas. 1-3 bows=crystal plus helps level your character fast below lvl 70. Will poop out rare items still too.
CRAZY GOOD organic poly hack: Find one that can make organic polymer.. Keep it separate from others and store unopened crystals in a bin, no spoil timer! You can keep hundreds on hand at all times. Updog so others can see
When raising a baby gacha, fill their inventory with stacks rare mushrooms. They don't prefer them over other foods, but they will eat them if they have to and each mushroom regains alot of food. This will keep them from starving. This is really easy on aberration. They will still drain your berry troughs, but this will give you peace of mind when you've got other things to do. "UP" if this helps at all.
Gachas are essentially living lootboxes and resource farms. They will eat anything (including stone, wood, or fiber) and turb it into crystals which can drop a variety of resources including black Pearl's, organic polymer, or obsidian, among other things. They also have a rare chance to drop higher-tier crystals which turn into upgraded armor and tools