Garen changes that can give him more Depth and viability
Garen suffers right now, even after his buff. His lack of in-combat sustain and lack of CC make him not a very good pick overall, so I have come up with 2 way to reward Garen players for smart ability usage, while not making him crazy OP
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W Cooldown increase dramatically to compensate for the changes I will propose.
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If Garen uses Q while W is active, he will instead stun the target (0.5/0.75/1/1.25/1.5 seconds). Early on, this makes Garen choose between using his Q for the stun and miss out on potential damage reduction, or silence his target and keep W for later. Late game, Garen will be able to use it up to 2 times with enough CDR
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While Garen's W is active, he has access to his passive with modified effectiveness. I would make it 2x as effective, to help him sustain himself late game. Think of it as a mini Volibear W. If Garen is out of combat however, he won't gain this bonus.
These changes give Garen in-fight sustain and hard CC, things he definetely needs. He has been suffering the most recently because he can't sustain himself in a fight so he loses to juggernauts in long trades, but he is too slow to hit and run.