One will always be the rage ability you used the most and gained the most EXP with and the other one will always be random. And what random spell comes depends on if you have all abilities of that spirit yet. If you do not have all rage spells of one spirit, you will be prompted with taking it with a high chance. So if you plan on maximising a spell early on, make sure you use it a lot.
You can read more on spirit leveling when using the search function. It's all spread out in detail for you.
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