Skill Build:There are few skill build, depending on situation:
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This is normal build, one level of heal to prevent first blood attempts. One level of Slow to help ganking and killing, then maxing Splinter to deal damage. This is best used in side-lanes, where you could use splinter while chasing, and not rely on creeps to be there for damage.
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This build is used against Solo lane, since you won't have to rely on Splinter to kill enemy, and will have slow instead. One level of heal is a must. Splinter is maxed after Slow for killing potential.
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If you are facing extremely awful harassment team, and cannot survive easily, you will need to max Heal ASAP and have arctic burn at hand, to harass back and survive, or even kill those harassers.
Gameplay:Lane:
Wyvern can go any lane. He can go mid, to get quick level 6, and outharass their mid. It works pretty well, you have heal, taking a bit of damage, or even towerdiving wont hurt at all. Take all farm you can, you will be semi-carry of your team.
He can also go side lane, and support carry. In this case, you will keep healing ally, and harassing enemy. Also, it won't hurt being ward bitch, especially after the wards became cheaper (from 200 > 150 gold).
Early Game:
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You start your Early game with combination of mantles, branches and tango/salves/clarities. This is mostly used for mid or lanes. You can also get soul ring recepie, sobi mask, some heal and mana, and head of to side lane (or mid if team has courier).
Do not atempt to make First Blood! You are defensive hero, at least in beginning, so just stay back, harass a bit, farm, and simply wait till you get slow and/or nuke.
Mid Game:
When you reach level 6, you should have Urn and Arcane boots (or just arcanes, if you let carry farm). At this point, you should gank other lanes, since you became quite scary now.
When you start ganking, always initiate by casting Splinter on creep nearest to enemy. Then use Arctic Burn, slow enemies, and keep whacking. Don't be afraid to use ultimate, it has low CD, and will be ready soon. If there is noone to gank, stay in lane, and make enemies go back. You wont even need to go to base, since you have heal and mana.
Late Game:
This is part where little cold wyvern becomes badass Frost Wyrm. This is part where you shine most, unlike most of other INT heroes. How so?
First off, you have massive teamfight presence. If correctly used, your ulti can one-shot any enemy, while stunning everything around it. Then, your Cold Embrace became far more powerful, since its % scales into late game, and so does physical damage. Then, you got 1k range, with some DPS items, you can pick off supports without a problem. If you have carries, don't be afraid to turtle a bit, both you and carries are getting scarier later on.
ItemsCore items:
Arcane boots:
Other boots are simply not good enough for Wyvern. He is constantly ganking, and needs more mana. Later replace these with Boots of Travel.
Urn of Shadows:
Gives some much needed health, and free salves. Get it if noone else in team has Urn. Its mana regeneration comes in handy on lane.
Magic Wand:
Instant heal is imba. In team battles, charges fill in like mad with all the spells flying around.
Null Talismans:
Some stats arent bad. Later can be turned into Dagon.
Lothar's Edge:
This hero has escape mechanism, however, he needs positioning and damage as well. Lothar gives him both, and is especially useful after its cost decrease! You can use 150 extra damage to snipe off enemy from 1000 range. You will mostly use it for escape and initiation though, since Arcane Burn lasts only 6 seconds, that will make you vulnerable often.
This guy can farm very well, thanks to his Splinter shot that one-shots all ranged creep enemies in early-mid game, thus earning a lot of cash for late game.
Guinsoo's Scytle of Vyse:
This is very useful item, you can't go wrong with it! Besides, you lack disable, aside from Ultimate, so you should get either this, or Eul.
Eul's Scepter of Divinity:
Guinsoo's little brother, but still very useful. Get either this, or Guinsoo every game.
Orchid Malevolence:
This item comes in small, cheap components, and is useful against spellcasters, or heroes that have gamebreaking skills. It can also be used to counter blinkers.
Shivas Guard:
One of my favorite items ingame. You will one-shot whole pushing wave with Splinter + shiva, and slow enemies even more, so its definitively a must item in late game..
Dagon:
Item great in ganking. It loses effectivness later in game, so if you fail to get it by minute 20, focus yourself on getting shiva instead. Never upgrade dagon. 100 extra damage (plus reduced by magic resistance) isn't worth 1350 gold!
Veil of Discord:
Very nice item, amplifies damage by Splinter. Get it if your team is composed of spellcasters, and someone already bought Meka.
Mekansm:
You should try to rush this item if you are support. If you decide to take semi-carry role though, focus on one of other items.