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There is no time to draw graphs, so here are 2 more suggestions:
1). Make the effect of the +50% spell permanent.
2). Make the spell enhancement effect depend on the hero's level. For example, 5-10% per level.
This way, nothing needs to be changed drastically, but Luna will slow down in her development, which is the main goal. All that remains is to find the right numbers so that she doesn't slow down so much that she becomes useless!
1). Make the effect of the +50% spell permanent.
2). Make the spell enhancement effect depend on the hero's level. For example, 5-10% per level.
This way, nothing needs to be changed drastically, but Luna will slow down in her development, which is the main goal. All that remains is to find the right numbers so that she doesn't slow down so much that she becomes useless!

