Approved trial chamber expansion. Food pools allow one added food stack; unique artifact pools allow one added artifact. Material pools roll independently. Existing additions retained. Key tables, dispensers, falling items and equipment unchanged. Chances per target-table invocation, not per vault/spawner completion.

minecraft:chests/trial_chambers/corridor
  createaddition:iron_rod: 8%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 1, "max": 2}, "add": false}]
  create:copper_nugget: 8%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 3, "max": 6}, "add": false}]
  create:andesite_alloy: 4%, []

minecraft:chests/trial_chambers/entrance
  farmersdelight:canvas: 8%, []
  farmersdelight:stuffed_potato: 6%, []
  farmersdelight:melon_juice: 4%, []

minecraft:chests/trial_chambers/intersection
  create:electron_tube: 5%, []
  create:cogwheel: 6%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 1, "max": 2}, "add": false}]
  createaddition:electrum_nugget: 6%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 3, "max": 6}, "add": false}]

minecraft:chests/trial_chambers/intersection_barrel
  createaddition:electrum_nugget: 6%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 3, "max": 6}, "add": false}]
  alloyed:steel_nugget: 6%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 3, "max": 6}, "add": false}]
  brewinandchewin:flaxen_cheese_wedge: 5%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 1, "max": 2}, "add": false}]

minecraft:chests/trial_chambers/reward_common
  createaddition:electrum_ingot: 4%, []
  farmersdelight:mushroom_rice: 4%, []
  brewinandchewin:flaxen_cheese_wedge: 3%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 1, "max": 2}, "add": false}]
  farmersdelight:melon_juice: 3%, []

minecraft:chests/trial_chambers/reward_ominous_common
  alloyed:steel_sheet: 5%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 1, "max": 2}, "add": false}]
  dungeonsdelight:silverfish_fried_rice: 4%, []
  farmersdelight:steak_and_potatoes: 3%, []
  dungeonsdelight:spider_bubble_tea: 3%, []

minecraft:chests/trial_chambers/reward_ominous_rare
  modular_backpacks:potion_bag: 2%, []
  createaddition:electrum_ingot: 4%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 1, "max": 2}, "add": false}]
  create:golden_sheet: 4%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 1, "max": 2}, "add": false}]

minecraft:chests/trial_chambers/reward_rare
  modular_backpacks:reinforced_buckler: 2%, []
  modular_backpacks:gilded_quiver: 1.5%, []
  create:electron_tube: 4%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 1, "max": 2}, "add": false}]

minecraft:chests/trial_chambers/supply
  farmersdelight:canvas: 4%, []
  farmersdelight:stuffed_potato: 6%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 1, "max": 2}, "add": false}]
  farmersdelight:beef_stew: 5%, []
  farmersdelight:dumplings: 5%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 1, "max": 2}, "add": false}]
  farmersdelight:melon_juice: 4%, []

minecraft:chests/trial_chambers/reward_unique
  artifacts:cloud_in_a_bottle: 1.5%, []
  artifacts:steadfast_spikes: 1%, []
  artifacts:power_glove: 0.5%, []

minecraft:chests/trial_chambers/reward_ominous_unique
  artifacts:shock_pendant: 1%, []
  artifacts:feral_claws: 0.5%, []
  artifacts:power_glove: 0.5%, []

minecraft:pots/trial_chambers/corridor
  twigs:pebble: 6%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 1, "max": 2}, "add": false}]
  twigs:twig: 5%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 1, "max": 2}, "add": false}]
  create:copper_nugget: 4%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 1, "max": 3}, "add": false}]
  twigs:silt_ball: 3%, []

minecraft:spawners/trial_chamber/consumables
  brewinandchewin:jerky: 4%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 1, "max": 2}, "add": false}]
  farmersdelight:stuffed_potato: 3%, []
  farmersdelight:dumplings: 3%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 1, "max": 2}, "add": false}]

minecraft:spawners/ominous/trial_chamber/consumables
  brewinandchewin:jerky: 6%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 1, "max": 2}, "add": false}]
  farmersdelight:stuffed_potato: 5%, []
  farmersdelight:dumplings: 5%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 1, "max": 2}, "add": false}]
  dungeonsdelight:silverfish_fried_rice: 4%, []
  brewinandchewin:creamy_onion_soup: 4%, []
  dungeonsdelight:spider_bubble_tea: 3%, []
  create:experience_nugget: 8%, [{"function": "minecraft:set_count", "count": {"type": "minecraft:uniform", "min": 2, "max": 4}, "add": false}]
