Propose Dungeon Trait: Residents: Residents 0 [Residents*0], this dungeon will not generate life, but may contain immigrants.
Residents 1 [Residents*1], dungeons will produce basic plant and animal life the size of lizards and snakes, but cannot sustain the animals on it's own, so gathering of outside food is necessary. Along with generating 0.1 Essence worth of creatures each year. Upon creation, a full year's worth of creatures will appear in the dungeon, after that, the growth is the slow pace it used to be.
Residents 2 [Residents*2], dungeons will produce basic plants and animals the size of bats and cats (or tiny venomous bugs), it still cannot sustain the animals on it's own. Along with generating 0.2 Essence worth of creatures each year. Same as before, a year's worth of creatures are generated when the dungeon is created.
Residents 3 [Residents*4], dungeon will produce plants with medicinal or poison properties, and animals can have poison and be snake size, or not and be dog size, it still cannot sustain it's animals on it's own. 0.3 Essence worth of creatures generated every year.
Residents 4 [Residents*8], dungeon will produce plants with medicinal or poison properties, and animals can be cat size poisonous, or wolf size, still dependent. 0.8 Essence worth of creatures.
Residents 5 [Residents*16], dungeon will produce strong plants capable of sustaining it's inhabitants, and animals can be big as bears. 2 Essence worth of creatures.
Residents 6 [Residents*32], dungeon creates weak elemental entities, animate plants with powerful medicinal or poison properties, the animals are magical in nature. 3 Essence worth of creatures.
Residents 7 [Residents*64], dungeon creates elemental entities, powerful living plants with magical properties, contain magical beasts of mammoth size. 5 Essence worth of creatures.
Residents 8 [Residents*128], dungeon creates eldritch entities, powerful living plants with powerful magical properties, contain forgotten beasts. 8 Essence worth of creatures.
Residents 9 [Residents*256], dungeon creates avatars of magic, plants capable of terraforming, contain great forgotten beasts. 15 Essence worth of creatures.
Residents 10 [Residents*512], dungeons creates divine beings, plants capable of spreading outside which contain nightmarish power, contain great mythical beasts. 25 Essence worth of creatures.
((The creatures are made with traits, while the plants and animals require no such description, they can be generic, but you can give them a description if you want to.))