How to use Cull Obsidian in LOL?

GOTGGOTG Member Posts: 1,040 ★★★★
in Strategy and Tips
I don't have good option for LOL so I intend to use rank 5 Cull Obsidian. I saw some clips on youtube but don't think it's clear enough so can you guys give me some tips? Synergy, mastery set up (should I use suicide?), ex...

Thanks.
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