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watch the end of my video i covered a lot of interactions of the skarner ult in it :)

Good eye, I had missed that one thing.

Basically once you have Sheen built you build based on situation so if the enemy has ridiculous CC such as Nautilus or Leona then mercury threads are the way to go. If all AD then ninja tabi are your friends but in general if you want to keep ganking or instill fear of roaming go to boots of swiftness.
Never get boots of mobility or lucidity because they aren't so great on Skarner with the rest of the build!

Thank you for reading my guide:)

Awesome guide. It's very informative for a first time Skarner. I have just one question. Why do u not upgrade the tier 1 boot to tier 2? Do u just sell it or should u just keep it and upgrade it?

Thank you and yes it is my very first guide, took 2 entire weeks to get all the information in a desirable format. I will look into the rainbow text and fix it up so it doesn't distract too much and maintains the key points it was intended to.

As for Trinity Force the real objective here is to rush Sheen as the passive works wonder with the spammable Q (CD of 4 seconds which is reduced 0.25 seconds every AA, 4X against champions). Finishing it is no priority but it does provide the best balanced offensive options for a jungler like Skarner who scales off everything possible.

Refillable potion is not worth much right now in the jungle especially at the start since health potions give 150 HP each over 15 seconds totalling 450 HP which is mandatory in the jungle for first clear. The refillable potion is 125 HP over 12 seconds which is 250 HP, notice the HUGE 200 HP gap here, if you get invaded or have a squirmish in the river or in lane that difference will be the biggest advantage/disadvantage. Not to mention Skarner does not need potions after his first clear, he gets too tanky and the lifesteal from Stalker's blade is often more than enough.

Thank you for pointing it out, I will add a section covering this.

Is this your first guide? It's very impressive if it is :) Overall, a solid guide (though I don't really play Skarner so I can't really say anything) but I would just say be careful of using too many colors at once. It can create "rainbow text" and become distracting for the reader (mainly looking at the items section, here.)

Also, Trinity Force to me seems like a pretty ambitious buy, especially as a first item. It's very expensive, and the jungler is already at a disadvantage in terms of gold (as compared to the laners whose income is much more steady). Also, thoughts on starting Refillable and upgrading to Hunter's Potion (and selling later in game for more item slots)?