/// <summary>
/// Removes a spell from the spellbook.
/// </summary>
/// <param name="spell">The spell passed to the method.</param>
public void RemoveSpell(Spell spell)
{
_spells.Remove (spell);
}
/// <summary>
/// Adds a spell into the spellbook.
/// </summary>
/// <param name="spell">The spell passed to the method.</param>
public void AddSpell(Spell spell)
{
_spells.Add (spell);
}