How do you counter Int Sion?

I finally had to face someone playing it, and it was actually rather annoying. He's too inherently durable to force him off the turret before Demolish procs, and even if you DO manage to kill him he just continues hammering away at your turret even faster because he has 1.75 AS while he's undead. For that matter, how come an 0/4 Sion with Tiamat and Jaurim's Fist could 1v1 me as a 3/2 Garen with Phage and Sheen and win? I don't even understand how he out-damaged me considering I didn't even get hit by his Q.
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