Ok, the idea is “if the creatures are from the same species (for example sniper skeleton) you can instead breeding them you can mix cores” for example:
Sniper skeleton core + sniper skeleton core = sniper skeleton + 3 core
Sniper skeleton core + sniper skeleton core +3 = sniper skeleton + 7 core
sniper skeleton core +3 + sniper skeleton core + 7 = sniper skeleton + 12 core.
If the gene strength is going too high you must complete a ritual.
Another idea is when you breed a monster you can see their genealogic tree to see what are their parent, grampasm etc…
Thanks for reading, I`m in love with the game.