Spawn Shell
==========================

.. code-block:: csharp

  public Shell SpawnShell(GameObject shellPrefab, Vector3 position, Quaternion rotation, Unit owner, Unit target)

Shoots a shell: instantiates ``shellPrefab`` (a purely visual prefab — no ``Rigidbody``/``Collider`` needed on it) at ``position``/``rotation``, creates a :ref:`shell` object and initializes it via ``Setup`` with the given ``owner`` and ``target``, then starts tracking it so ``ShellSystem`` ticks it every frame.

Returns the spawned ``Shell``, so you can, for example, call ``SetCustomDamage`` on it right after spawning — this is exactly what ``ShellAttack`` does to apply per-attack custom damage.