Counter for Abaddon The Lord of Avernus : Mogul khan - The Axe 

This guy would be the biggest problem for Abaddon because of his ulti. When you cast burrowed time it means nothing for this guy a berserker’s call then ulti would kill you any time. So watchout…

Abaddon ’s GUIDE :

Early Game:

Get ring of basilus (sobi mask+ring of protection), ring of regeneration and animal courier if you can afford it.

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Early Game:
Lvl 1 ~ 6

ITEMS :

Ring Of Basilus, Lesser Clarity Potion, Flask Of Sapphire Water

Ring Of Basilus will give a +65% Brilliance Aura which is quite useful at your case because of your low starting mana. The flask and clarities are only backups if you received some nukes or you’ve used a skill to harass a hero.

STRATEGY :

Try to go into a lane with a melee hero, or a hero with no strong nukes like Zeus, Lina, Lich etc.. as much as possible, creep denial should always be your first priority, the creep killing is 2nd to your list.. If you decide to harass a hero at lvl 3 Paralyzing Cask and a lvl 1 Death Ward on your hand you can do so, Jst clean up the melee creeps then try to keep the ranged creep alive so the casks should bounce only on the two units.. ( hero & creep ) most melee hero stay on the back of the ranged creep so they can get exp, thats the right opportunity for you to do your job.. at lvl 3 Paralyzing Cask it can bounce 6 times meaning, 3 sec disable for your enemy hero and sufficient time to cast a Death Ward. Remember dont cast the Death Ward in front of the target, cast the ward at his back meaning, you should cast it in a place he would surely go to flee..
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COUNTER HEROES  Leviathan - The Tidehunter :   Life Stealer, Centaur Warchief, Magnataur, Stone Giant

GUIDE :

Early Game

Ok, so you are using the leviathan. He is by no means the "best" hero in the game. But as far as the tanks go, he is very strong. I usually save my mana, and use no spells so when I finally hit level 6 I can use my ravage. Occasionally, if an enemy hero is low, I will try a gush on him. Gush has a long range and decent damage, but you wont be pwning many heads with it.

I recommend an animal courier for this hero. I usually would not, but the Leviathan is so ponderous that you really do waste a lot of time walking back and forth, unless you’re in the middle lane.
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COUNTER HEROES FOR ATROPOS : Omniknight, Anti-Mage, Silencer, Life Stealer

THE BANE ELEMENTAL GUIDE : 

Early Game: Lvl 1 ~ 6
ITEMS : Belt Of Giant Strenght, Staff Of Wizardry

The belt gives you str bonus, meaning added hit points, while the Staff Of Wizardry give a +10 intelligence bonus, meaning, +10 damage because your primary attribute is Int, and also bonus mana points.
 
Creep Block

Creep blocking is an art. Art of trying to read more