Familiars
Based on: the animals in Harry Potter world. Owls, cats, rats (happened to be an animage :) )
Mechanic: similar to PGO buddy. Each player can have one familiar. It needs to be cared of. Owl would eat seeds, cat would drink water, rat would eat ingredients... When they are happy and walk with the wizard, they give some very light improvement. 1 spell energy / km / 30 mins, or 5 minutes less brew time / km / 30 mins, or find 1 ingredient / km / 30 mins.
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So basicly a simplified version of this: https://community.harrypotterwizardsunite.com/en/discussion/1652/suggestion-familiars, yes?