Breeding the Umbra produces fertilized eggs that require careful temperature control. Incubation temperature must stay between 80°C and 90°C - use Air Conditioners, Standing Torches, or Dimetrodons to maintain the range. At the correct temperature, the egg hatches in approximately 4 hours and 59 minutes.

The baby Umbra takes approximately 3 days and 20 hours to fully mature at default rates - at a glacially slow pace - plan for a multi-day commitment. The most labor-intensive part is the baby phase (0–10% maturation) when it can't use a Feeding Trough yet.

Each baby inherits stats from both parents with a chance of mutation - +2 wild levels to a random stat plus a color change. Use the breeding calculator to plan food requirements, incubation timers, and maturation phases.

The Umbra's growth progresses through three stages: Baby (0–10%) lasts ~556 min and requires constant hand-feeding. Juvenile (10–50%) spans ~37h - it can eat from a Trough now. Adolescent (50–100%) takes ~46h - continues eating from troughs, nearly fully grown.

Imprint bonuses are significant: a fully imprinted Umbra gains 30% extra damage and damage resistance with its imprinter mounted. Imprint requests include cuddling, walks, and specific kibble - check the wiki for which kibble to stockpile.

The raising calculator above shows exactly how much food you need for each maturation phase of the Umbra. Expect ~556 minutes of active care during the Baby phase before it graduates to trough-feeding as a Juvenile.

The multiplier feature helps plan large-scale Umbra raises by totaling food across all babies. Different food types have different spoil timers - factor that into which food you stockpile.