One of the hardest things to tweak in an OSR ruleset (original or close) is the spell lists. Sure, you can remove spels from the available selection, but do you ever add new spells?
I ask, because in general, when I see new spells in an OSR adventure, they are rarely there to be added into the PCs hands, and accurate spell level / power is largely irrelevant. It's when you write up a spell for the players to actually use, that you realize how hard they are to correctly balance.
I wrote up a couple of cleric / druid spells last year and posted them on the blog. They were well received, but they weren't really adventuring spells (which is what occupies actual spel lists - non-adventuring spells could be a whole 'nother post).
Do you write up spells as a DM for your players? Do you allow or even encourage your players to write their own?
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