garens is horabad, so nunu.
Nunu if he's not terrible. Garen chases to silence, nunu slows him with insane damage. Garen uses WW to keep chasing, Nunu uses blood boil and escapes. He then feasts to sustain his hp.
I went against Garen as Nunu once. Can't remember who won, but I've had easier times against Yorick. His silence is just really annoying if he hits you.
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