Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
like the build name states, with janna you are early support, and with deathfire grasp, you are a late game killer. you have enough AP to do this partially due to runes. you NEED the AP/lvl runes. they make a huge difference. when the game gets later, change out dorans ring for a void staff. that gives you even more mpen, and it gives more AP. keep in mind the ring is only there as a place holder, until you get to needing the void staff. i havent reached the point in a game where i even get the deathfire grasp, but if it happens, then the game is a good one. the idea for support is this: you use howling gale as a disable for you teammate, and use eye of the storm as you main support skill. zephyr is to make it so you do not die (the passive), and if you guys need that little bit of extra damage, which turns into a lot of damage late game. howling gale from bushes if your able, as people cannot see the charge. placing with this skill will make or break the game. its also the difference between a good janna and a bad one. most people keep sound off, so this is something that is entirely useful. or people dont hear the gale above there own characters talking, or abilities making noise. use that knowledge to your advantage. you only get one point in eye of the storm, because that is sufficient till later, and you need the others more for better support. if you can damage and disable them enough, your teammate should be able to take them out no problem. remember: YOU ARE A SUPPORT. dont try to get the kills, that will only get you killed till late game. GL and HF with janna, the storms fury! if you downvote, please say why, so we can all learn. thanks in advance!
-Zelkar(thats my in game name)