Spider het pied * pastel het pied:
1/16 Bumble Bee Pied
1/16 Pastel Pied
1/16 Spider Pied
1/16 Pied
3/16 Bumble Bee 66% PossHetPied
3/16 Pastel 66% PossHetPied
3/16 Spider 66% PossHetPied
3/16 66% PossHetPied
Breed the BumbleBee Pieds from both lines (breeding siblings causes genetic defects, so mating pairs should always come from separate lines) together for the best probability of producing Killer Bee Pieds. This is a valid genetic path to Killer Bee Pieds. You may be new to genetics, but you seem to have a firm grasp of this one!