If you told atton that revan was lightside, a broken holocron and maybe a foot lokker. not sure though. If you said revan was darkside, then the holocron plays a message of bastila talking about the sith academy after revan left. she was talking about the fact that without a strong leader, it will fall into ruin and that she's going to look for revan. might have missed something. if i did hopefully someone will cover it