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Never rush Thornmail on a champ. First off I don't like that item, but it's your choice, so if you decide to buy that item, do not rush it. It would be more helpful to either get a smaller health after Aegis of the Legion as well, because you'll have alot of defensive stats, but no health to uphold them, or get MR earlier.

One itty-bitty thing about the builds. Look at This chart. If you take too much armor it begins to become useless, 400 armor being around the cap. Most of the builds take over 300 armor which isn't that helpful because of Defensive Ball Curl giving 120 armor/MR. Maybe you can add more MR or health in general?

The good looks really nice for a beginner guide, and after seeing how long you said you worked on this...I can tell you put a lot of effort into it. +1 :)

overall a good start

work on your coding. for instructions, check out jhoijhoi's guide on making a guide! also i recommend putting the pros/cons section after your introduction. more indepth information is needed. you should also add in a section other viable items, regardless of if you have the 5 builds.

keep up the good work!