[Andromeda]

Skill Build
1 - Comet
2 - Stats
3 - Comet
4 - Aurora
5 - Comet
6 - Void Rip
7 - Comet
8 - Aurora
9 - Aurora
10 - Aurora
11 - Void Rip
12 - Dimensional Link
13 - Dimensional Link
14 - Dimensional Link
15 - Dimensional Link
16 - Void Rip
17 - Stats+

Justification / Modifications:
Straightforward build. You can leave Comet at 1 and go for Aurora + Link early for a more teamfight/teamgank oriented build (i've seen it in some high level games recently).

Lane Starting Items:
Monkey Courier/Wards, 2x Runes of the Blight, 2x Mana Potion, 2x Minor Totem

Core:
Marchers >> Power Supply >> Striders >> Fortified Bracelet >> Wards >> Wards

One or two Bracelets and Power Supply for stats allow more spamming of Comet and Aurora, Striders for imba roaming. Always get wards, its your highest Item priority. You can get a Bottle if you feel the need for it or if there are few Bottles on other heroes, but don't take away the runes from your mid-laner.

After Core:
Staff of the Master >> Portal Key (>> Nullfire Blade)

This stuff is luxury. You should not have much gold since you are warding and constantly roaming. It's not uncommon for an Andromeda to finish a 30+ minute game with nothing more than 2 Bracelets and Boots.
That being said, SotM and Portal Key are your two most useful items after the core. Get a Nullfire at any point if your team needs to counter Jeraziah, Hellbringer, Hammerstorm or Dark Lady.

Information
Roles: Support, Ganker, Initiator
Properties: Roamer, Nuker, Disabler, Babysitter, Anti-Carry
Prefered Lane: long / short
Difficulty: 2 - Easy
Farming capabilities: 2 - Weak
Item dependancy: 2 - Low
Power:
- Early Game / Lane Control: 4 - Strong (Comet)
- Mid Game / Ganks: 4 - Strong (Good Initiator and Anti-Carry Hero, Very Good at ganking and roaming)
- Late Game / Team Fights: 2 - Weak (Late game her job is to single out and swap their carry)

30-Seconds-Guide:
- Gank a lot! That's your primary task. Let your carries get the kills if possible.
- Once you get Portal Key you can queue it up after Void Rip to teleport right back to your allies.
- You are responsible to keep wards up at all times. Delay your items to buy wards.

Counters:
- Most Andromedas will play the roamer/supporter style described here. Gankers are best countered with vision, map- and rune control -> Wards.
- If you are facing a Carry-Andro get some armor and you should be fine. She is outcarried by almost every other carry in the game.

[Slither]

Skill Build
1 - Poison Spray
2 - Toxicity
3 - Toxin Ward
4 - Toxin Ward
5 - Toxin Ward
6 - Poison Burst
7 - Toxin Ward
8 - Poison Spray
9 - Poison Spray
10 - Poison Spray
11 - Poison Burst
12 - Toxicity
13 - Toxicity
14 -Toxicity
15 - Stats
16 - Poison Burst
17 - Stats+

Justification / Modifications:
Get one level of Poison Spray and Toxicity for the slow and regen debuff but max wards first as they greatly help you pushing/creeping/scouting and even ganking. The build is kinda flexible, you can change it as you like but always have all 3 spells at level 4! Some guidelines: With a gankheavy lane (usually paired with a stunner) you can max Poison Spray for early kills. With a very push heavy team (defiler, ophelia, etc.) always max wards first and assist in tower pushing. And finally Toxicity can be maxed first if you play solo or heavy babysit as you most likely wont get early kills with Spray and Toxicity helps you a lot for lane control by harassing.
If you are playing Slither as a pure support hero consider putting only one point into Poison Spray and level Stats from levels 12-14. (Only damage and Range increase).

Starting Items:
Monkey Courier, Runes of Blight, Healing Potion, 2x Mana Potion, 2x Minor Totem

Core:
Power Supply >> Wards of Sight >> Ghost Marchers >> 1-2x Soulscream Rings OR Fortified Bracelets

If someone else gets a courier, buy Wards instead. Your job is to keep the Wards up so keep buying them! This is always more important than your core items! Ghost Marchers are decent to chase poisoned enemies down. They are slowed by at least 10% so you can keep up to most heroes with Ghost Marchers. It's also good for positioning your ultimate in team fights before you get Shroud or Portal Key. Soulscream Rings can be replaced by Fortified Bracelets as you see fit.

After Core:
Optional: Nome's Wisdom. Depending on your playstyle Slither can be quite Mana Hungry. Nome's is the best solution for that as it provides a very valuable aura for the rest of your team. Only consider it if noone else builds it.
1. Staff of the Master because Poison Burst is what you bring to Teamfights.
2. Assassins Shroud or Portal Key for better Ultimate positioning and survivability. Rule of Thumb: The higher skill level your opponents have the more you want Portal Key. Get one; don't get both.
3. If you are here you most likely did something wrong. You should never reach this point in a normal game unless you "forgot" to buy wards or went farming instead of ganking.

Information
Roles: Support, Ganker
Properties: Roamer, Babysitter, Pusher
Prefered Lane: Any
Difficulty: 1 - Very Easy
Farming capabilities: 3 - Decent
Item dependancy: 2 - Low
Power:
- Early Game / Lane Control: 4 - Strong (Good Harassing, even with auto attacks)
- Mid Game / Ganks: 3 - Medium (Very Powerful ult in ganks and teamfights)
- Late Game / Team Fights: 2 - Weak (Usually not played as a carry)

30-Second-Guide
- Gank, gank, and gank. Buy items that will help you gank, these include homecoming stones, Ghost Marchers, Power Supply and wards.
- Always have enough mana for the Poison spray+burst combo if Poison burst is not on cooldown. The combo takes 320 mana at level 6, 335 mana at level 7, 435 mana at level 11, and 535 mana at level 16.
- Set up Toxic Wards behind you and to your sides when pushing for scouting purposes. They have a 1400 Vision Range. Even at night!
- You can block paths with Toxic Wards.

Counters:
- Power Supply is an excellent Soft Counter aganist ward-spamming Slithers. Especially early game. Grab a Mana Battery ASAP if you are laning against him.
- While Geometer's Bane can no longer remove his ultimate, it still can remove Poision Spray including its slow.
- Shrunken Head will also not remove Poison Burst and you still get hit by it with activated Shrunken BUT you will take 0 damage from it while Shrunken Head lasts. Shrunken Head also removes all his other dots/slows and is thus a decent counter.
- If a Slither decides to go carry do not worry, he is EASILY outcarried. Otherwise get magic armor and/or Shrunken Head.