This guide is for Teemos who want the most plentiful and deadliest shrooms late game. There are two keys to doing this: maximizing AP and minimizing your ultimate cooldown. With the changes to cloud drake season 10, it is actually possible to get your shroom cooldown to around 4 seconds with 4 cloud drakes with the build detailed here! Even without any cloud drakes, you'll still be at 9 seconds.

This is a very late game build. That is not to say you will be weak in the laning phase but you may not score as many kills early on as you would with a build based around runes such as Aery or Electrocute. The goal early on is to CS as much as you can and charge your Manaflow Band and Dark Harvest by poking the enemy laner. Once you are able to roam, plant shrooms so that you can get assists to charge up your Ultimate Hunter. You won't really hit your shroom power spike until you've built your Archangel's Staff and most of your Nashor's Tooth. At that point you'll have 40% cooldown reduction and hopefully most, if not all, of your Ultimate Hunter stacks.

This build works great with patient teams, who are more defensive. If your team looks like it is going to lose by 30 minutes this might not be the build to chose and you'll just be beginning to shine at that point.

You'll be shocked at the quantity of shrooms you can plant late game and the damage they will do. You'll be getting assists (or stealing kills) left and right and will have no problem getting your Mejai's to 25 stacks. Expect to hit 1000 AP or higher. You'll have no problem carrying late game as you'll make objectives such as Baron and Elder Dragon impossible for the enemy team to take. Then you can lock them down in their base making them afraid to leave their nexus.

Late game, you'll have some huge power spikes when:
- Your Archangel's upgrades to Seraph's
- You complete your Ultimate Hunter (and Eyeball Collection)
- You build stacks on Dark Harvest (hoepfully at least 20-30!)
- Gathering Storm increases your AP (exponsentially!)
- Your team has one or more cloud drakes (50% of games have 1 cloud drake, 25% have multiple, 25% have none)

Late game you are going to want to secure objectives such as Baron and Drakes by flooding the area with shrooms.

Dark Harvest is one of the best scaling ruins and will maximize your late game damage. Even if you are unable to get kills early game, it is important you get your laning opponent below 50% as often as possible to build up stacks.

You'll be impairng enemies all the time with Teemo, so Cheap Shot is a good choice. Taste of Blood is good too, but you shouldn't be getting hurt too often and shouldn't be needing healing. Cheap Shot gives damage so its generally better.

Eyeball Collection gives AP and more damage so its better than the other options

Ravenous Hunter is by far the more common choice here, but this is a build to maximize late game shrooms, and Ultimate Hunter is the keystone here. Ultimate Hunter is what is going to push your shroom CDR to 9 seconds (or 4 seconds with cloud drakes).

Manaflow Band is great early game to help with mana issues. Spend the early laning phase charging up your band by poking with Q and hopefully getting some Dark Harvest stacks, too. Absoulte Focus is not a bad choice as it gives you AP whne you are at high level (and you should be), but you might run into mana issues early game, especially if you like to poke with Q.

Gathering Storm is critical for ultra-late game AP. You're going to be casting a lot of shrooms to defend your nexus if the game goes long and Gathering Storm lets you slowly build up more and more power as time goes on.

You are going to be getting lots of assists and kills but rarely dying and you want maximum late game AP, so Dark Seal is the way to go here. While it doesn't give you the mana regen of Doran's Ring, it does give you some extra mana which really helps. Plus, it lets you start with Refillable Potion which is great against poke-heavy opponents.

You'll usually want to build your items in this order:

Liandry's is the best item in lane for Teemo. It gives you AP, health, extra damage and a burn.

Sorcerer's Shoes gives magic pen and should be a no-brainer for Teemos.

Archangel's is not commonly chosen on Teemo but it offers a huge boost in AP, second only to Rabadons, once it transforms. It also gives you all the extra mana you need late game to continually spam you shrooms. Without it, you will run out if you have multiple cloud drakes.

Nashor's Tooth is great on Teemo for its AP, attack speed, auto attack damage, but most importantly its 20% cooldown reduction. Between Archangel's and Nashor's, you will hit the 40% cooldown cap.

Mejai's is great late game because it will give tons of AP. You shouldn't be dying much so it is easy to build up even if you are mostly getting assists.

Finally, Rabadon's is the item to cap it off. Once you are full build, you should have around 1,000 AP.

Void staff is useful if the enemy team is building magic resist. Sometimes I sell boots for it late game since the AP helps a bit, too.

I used to use Luden's in place of Archangel as it gives mana and 20% CDR and decent AP. It can give away your position, though, and it does not give as much AP as Archangel does once it transforms.

Morellonomicon is the standard choice for mages who are facing a heavy-healing teams due to the fact it gives you Grievous Wounds. If you opt to take it, make sure you still take Nashor's and Archangel's or Luden's so you still get 40% CDR.

If you want to buy a poition late game, Elixir of Sorcery is the way to go.

You'll notice no defensive items such as Zhonya's. That is because you shouldn't be getting hit too much as you'll be sticking mostly to tossing shrooms from the back line late game.