Currently you get 1 bright engram every 5 levels once you hit max level in the season pass.
I think it would be nice if in addition to that, you got 1-5k glimmer, 10 legendary shards, and 5-10 planetary materials each level up.
It would just be a good way to reward players who keep playing and help people stock up on resources for the next season.
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Every 20 levels could give you an ornament for each seasonal weapon as well? I mean... the new weapons are great and all but it would be prety great not having a linear fusion rifle take up half my screen.