A summoner class that instead of summoning a monster it calls upon its soul to merge with them and transform. If they summon a say a fox soul they'll change into one with increased speed or critical hit/rate. If it's a bear, increased HP and so on.
Of course it can become OP so there will either be a longer cooldown or a "spirit bar" that needs to fill by killing their enemy mob. Their weapon will be a summoning book.
They'll be a jack of all trades class... :3
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