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Can a Familiar level up with its master during their adventures and improve their stats, abilities and skills, or are they fated to stay as written in the Monsters Manual?

I want to know cause I'm looking at a sprite for a Warlock build and it has only 2 HP. I know I can always recast but aesthetically I kinda want it to be like a an adventuring companion. With 2 HP a falling book would kill it.

Can a Familiar level up with its master during their adventures and improve their stats, abilities and skills, or are they fated to stay as written in the Monster Manual?

I want to know because I'm looking at a sprite for a Warlock build, and it has only 2 HP. I know I can always recast but aesthetically I kinda want it to be like a an adventuring companion. With 2 HP a falling book would kill it.

Can a Familiar level up with its master during their adventures and improve their stats, abilities and skills? Or are they fated to stay as written in the Monsters Manual? I want to know cause I'm looking at a sprite for a Warlock build and it has only 2 HP, I know I can always recast but esthetically I kinda want it to be like a an adventuring companion. With 2 HP a falling book would kill it.

Can a Familiar level up with its master during their adventures and improve their stats, abilities and skills, or are they fated to stay as written in the Monsters Manual? 

I want to know cause I'm looking at a sprite for a Warlock build and it has only 2 HP. I know I can always recast but aesthetically I kinda want it to be like a an adventuring companion. With 2 HP a falling book would kill it.