Thanks! You just gain one spell per day. Only wizards gain the benefit of being able to gain more spells. An elf wizard wouldnt need to choose Magic Detection since they can already cast it. Hope that helps.
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So an Elf Warrior (or Thief, or Cleric, or Pathfinder) could choose to be able to cast Magic Detection once per day, or a Gnome Warrior (or Thief, or Cleric, or Pathfinder) could choose to be able to cast Illusion once per day, but an Elf Wizard or Gnome Wizard would gain nothing from choosing the bloodline spells and should always choose the +1 to Aur instead. That makes sense. Thank you again for the helpful replies! Now I can have my players roll up some characters.