Breed mode add lootable eggs dropped by enemy spawners.
- Biter eggs loot by biter spawners
- Spitter eggs loot by spitter spawners

Eggs can be used like grenades who invoke friendly creatures. Several technologies allow player to combine small versions of eggs to bigger versions.
- x10 small eggs -> x1 medium egg
- x10 medium eggs -> x1 big egg
- x10 big eggs -> x1 behemoth egg
- x1 behemoth biter egg + x1 atomic bomb -> x1 explosive biter egg

New biters with explosive capacity also appear during late game. They are faster then every other enemies and trigger a small nuclear explosion (half of atomic bomb) if they reach there target.

Feel free to send feedback.