Nexus
idas:nexus
Biomes
Nexus generates in these biomes and biome tags:
#idas:has_structure/ancient_portal_biomesPlacement
Nexus: the world places one attempt in every 60×60-chunk region, at least 40 chunks apart; it shares its placement set with other structures (weight 1).
Mob spawning
This structure overrides spawning for: monster.