Structure spawn overrides
Generated from the 26.2 decompile by
tools/gen_reference.py. Do not edit by hand.
Which structures replace a biome’s spawn list, for which mob category, and with what. A structure JSON’s spawn_overrides map is read into Structure.spawnOverrides; NaturalSpawner asks the first structure at the position that declares an override for the category, and if one answers, the biome’s list is not consulted at all. An override with an empty spawn list is therefore a ban, not a no-op. box is piece (only inside a piece’s own bounding box) or full (anywhere in the structure’s). The mechanism is on entity lifecycle; the nether fortress has a second, hard-coded list in front of this one.
34 structures carry the field · 6 declare an override · 23 overrides in all
| structure | category | box | what spawns instead (weight, min–max) |
|---|---|---|---|
ancient_city | ambient | full | nothing — the category is suppressed inside the box |
ancient_city | axolotls | full | nothing — the category is suppressed inside the box |
ancient_city | creature | full | nothing — the category is suppressed inside the box |
ancient_city | misc | full | nothing — the category is suppressed inside the box |
ancient_city | monster | full | nothing — the category is suppressed inside the box |
ancient_city | underground_water_creature | full | nothing — the category is suppressed inside the box |
ancient_city | water_ambient | full | nothing — the category is suppressed inside the box |
ancient_city | water_creature | full | nothing — the category is suppressed inside the box |
fortress | monster | piece | blaze (10, 2–3), zombified_piglin (5, 4–4), wither_skeleton (8, 5–5), skeleton (2, 5–5), magma_cube (3, 4–4) |
monument | axolotls | full | nothing — the category is suppressed inside the box |
monument | monster | full | guardian (1, 2–4) |
monument | underground_water_creature | full | nothing — the category is suppressed inside the box |
pillager_outpost | monster | full | pillager (1, 1–1) |
swamp_hut | creature | piece | cat (1, 1–1) |
swamp_hut | monster | piece | witch (1, 1–1) |
trial_chambers | ambient | piece | nothing — the category is suppressed inside the box |
trial_chambers | axolotls | piece | nothing — the category is suppressed inside the box |
trial_chambers | creature | piece | nothing — the category is suppressed inside the box |
trial_chambers | misc | piece | nothing — the category is suppressed inside the box |
trial_chambers | monster | piece | nothing — the category is suppressed inside the box |
trial_chambers | underground_water_creature | piece | nothing — the category is suppressed inside the box |
trial_chambers | water_ambient | piece | nothing — the category is suppressed inside the box |
trial_chambers | water_creature | piece | nothing — the category is suppressed inside the box |
The other 28 structures that carry the field carry it empty, which is the same as not carrying it: the biome’s list stands.