: These animals are his primary living symbols. In art, he is often shown in a chariot drawn by hippocampi (fish-tailed horses).
The "proper piece" for Poseidon depends on whether you are looking for his mythological weapon, a symbolic item for worship, or specific equipment in popular games. Mythological & Symbolic Poseidon
If you are playing a specific game, the "proper piece" or build refers to: : These animals are his primary living symbols