Minecraft 1.16.5 Forge 36.2.35 mod 2.2.12
Loot table use "loot_table" as entry type and each one has weight 1, this will make every artifact has different chance to be selected. For example, "atum:atems_homecoming" has 1/15 * 1/8 = 1/120 probability to be selected, but "atum:anubis_wrath" has 1/15 * 1/1 = 1/15 probability.
If this is not intentionally designed like this, to make every artifact has equal probability to be selected, there are 2 methods.
I. You can modify "atum:gods/all" loot table and use "minecraft:item" as entry type instead of "minecraft:loot_table".
II. Keep "minecraft:loot_table" type but modify the weight. For example, "atum:gods/atem" has 8 entries, so set its weight to 8.
Minecraft 1.16.5 Forge 36.2.35 mod 2.2.12
Loot table use "loot_table" as entry type and each one has weight 1, this will make every artifact has different chance to be selected. For example, "atum:atems_homecoming" has 1/15 * 1/8 = 1/120 probability to be selected, but "atum:anubis_wrath" has 1/15 * 1/1 = 1/15 probability.
If this is not intentionally designed like this, to make every artifact has equal probability to be selected, there are 2 methods.
I. You can modify "atum:gods/all" loot table and use "minecraft:item" as entry type instead of "minecraft:loot_table".
II. Keep "minecraft:loot_table" type but modify the weight. For example, "atum:gods/atem" has 8 entries, so set its weight to 8.