Breeding calculator

Two Pals of the same species always make that species. A fixed list of special combos comes next — those pairs always give the same named child. Every other pair is averaged: add both parents’ breeding power, add 1, halve and round down. The child is the Pal whose breeding power is closest to that number; on a tie the game prefers its internal priority, then the base form over a variant.

44,551 pairings of two different Pals among 299 breedable species (including the Terraria crossover creatures), plus 299 same-species pairs. 134 of the pairings are special combos, and one pair — Katress and Wixen — gives a different child depending on which parent is female.

No pair of other Pals produces these, so you need two of them: Bastigor, Bellanoir Libero, Blazamut Ryu, Cave Bat, Dandilord, Faleris, Frostallion, Green Slime, Grizzbolt, Gumoss (flower form), Hartalis, Jetragon, Lyleen, Mimog, Necromus, Neptilius, Orserk, Paladius, Panthalus, Selyne, Shadowbeak, Shaolong, Silvance, Xenogard, Xenolord, Xenovader.

It depends on the parents’ genders. A female Katress with a male Wixen gives Katress Ignis; a male Katress with a female Wixen gives Wixen Noct. It is the only gender-dependent pair in the game.

From the game’s own data tables as extracted by the open-source PalCalc project, resolved for every pair, and cross-checked against a second, independently published dataset. The two agree on every pair except those involving Depresso, Souffline and Solmora Lux, where a third source confirms the values used here.