1. Basic hero informations 
Abaddon, Lord of Avernus
STR 23 + 2.7
AGI 17 + 1.5
INT 21 + 2
Affiliation: Scourge
Damage: 55 - 65
Armor: 4.4
Movespeed: 300
Attack Range: 100 (melee)
Attack Animation: 0.56 / 0.41
Casting Animation: 0.452 / 1.008
Base Attack Time: 1.7
Missile Speed: Instant
Sight Range: 1800 / 800
2. Pros & cons- Durable
- Multi-lateral skills
- Can aid teammates (heal+damage block)
- Slows enemies, additionally hastens allies
- Stats gain fits his role
- Fairly effective even without items
- Nice starting damage and armor, comfortable animation for lasthitting
[-]Useless ultimate unless Abaddon is being targeted
[-]Somewhat low AGI+AGI gain
[-]Melee
3. Skill overview and spell combos Death Coil 
Now with increased range, Abaddon is capable of killing escaping heroes with low HP and healing his allies from greater distance. Note that this skill at lv4 heals 250 HP, while Aphotic Shield absorbs only 200.
I think it was a nice trade-off to increase DC's range while decreasing AS's when it comes to saving your teammates, even if it damages you half the amount you healed, since it has a much lower - and constant - mana cost.
Also be aware, if you use this skill as a nuke, the damage will be reduced by magic resistance, but you'll recieve the full, pure damage. You can deny yourself with this spell and max. range is 800.
Aphotic Shield 
Heals you the amount of damage you would take.
Another good and annoying spell, optionally it can be upgraded by Aghanim's Scepter (+2 seconds at all levels). This spell has a decent cooldown for an ultimate - one minute -, which mostly ensures that you can have it on in every major clash.
A bit of mechanics: can dodge projectiles upon casting, casting removes negative buffs, but Axe's Culling blade kills you instantly if you have 300 HP or less, no matter what.
Can be activated manually, but if you reach below 400 HP and it's not on cooldown, it's going to activate itself automatically.
Make sure your enemies attack you, otherwise this is a pretty useless ultimate.
Don't forget that this skill can't save you from getting instagibbed by a Mortred who crits over 9000, so don't be overconfident if the enemy heroes are all beefed up hardcarries after 90 minutes of farming and their worst item is something like Divine Raper Rapier.
Anyway, you are unlikely to get killed by neutrals.
FrostmourneGreat skill, but not that good early game. Still, it can be worthy to level it once, as it slows and helps you and your allies to outrun your opponents. Frostmourne not only slows your targeted enemy, but also makes your allies who are attacking the same target as you, recieve bonus attack and movement speed.
Combined with disables, this can lead to a fast end for the pinned down opponent. Note that this skill if a buff placer, and the buff if applied before Abaddon attacks, thus, upon the first hit, the effect is already active.
Buff placers don't stack.
Borrowed TimeHeals you the amount of damage you would take.
Another good and annoying spell, optionally it can be upgraded by Aghanim's Scepter (+2 seconds at all levels). This spell has a decent cooldown for an ultimate - one minute -, which mostly ensures that you can have it on in every major clash.
A bit of mechanics: can dodge projectiles upon casting, casting removes negative buffs, but Axe's Culling blade kills you instantly if you have 300 HP or less, no matter what.
Can be activated manually, but if you reach below 400 HP and it's not on cooldown, it's going to activate itself automatically.
Make sure your enemies attack you, otherwise this is a pretty useless ultimate.
Don't forget that this skill can't save you from getting instagibbed by a Mortred who crits over 9000, so don't be overconfident if the enemy heroes are all beefed up hardcarries after 90 minutes of farming and their worst item is something like Divine Raper Rapier.
Anyway, you are unlikely to get killed by neutrals.
4. Skill builds1. Aphotic Shield
2. Death Coil
3. Aphotic Shield
4. Death Coil / Frostmourne
5. Aphotic Shield
6. Borrowed Time
7. Aphotic Shield
8. Death Coil
9. Death Coil
10. Frostmourne / Death Coil - if taken Frostmourne at lv4
11. Borrowed Time
12. Frostmourne
13. Frostmourne
14. Frostmourne
15. Stats
16. Borrowed Time
17-25. Stats
Item BuildsStarting itemsWards,courier(then upgrade it),ironwood branch,heal salve,tango and magic stick
Core itemsMagic wand,boots of speed,teleport,observer wards and wards for invisible and sobi mask.
Extension itemsEul's,mekansm,vladmirs,pipe,PT (or BoT) and Necronomicon.
Luxury ItemsRadiance,aghanim,assault,guinsoo and HoT.
6. Foes & alliesFoes: Nerubian Assassin , Nortrom , Krobelus , Lion , Atropos , Rhasta
Allies: Leoric and Dazzle
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just suggestion ...do not be angry or do not panic xd
Throws a smoke bomb down in the area, silencing opponents and causing them to miss on most of their attacks. Also slows by 25% at all levels.
Teleports to a unit and strikes it if it is a foe, dealing bonus damage.
The Stealth Assassin is not afraid to fight dirty, and specializes in attacking his opponents from behind.