Support your carry until he get decent farm and use APHOTIC and MIST COIL wisely on early game until you get at least tranquil boots and void stone. The main focus on about how you play this build is cover your teammate as much as you can. The main reason to learn CURSE OF AVERNUS at lvl 3 is for helping teammate when they're chase down by the enemy. CURSE OF AVERNUS can slow down the enemy and you can provide safety to your teammate with APHOTIC and MIST COIL.
Mid game, get your mekans and proceed to eul scepter which disable 1 enemy to give advantage at team fight. If the enemy has a good carry, buy Heaven's halberd to disable him. With you now have 2 disable item, it should be easy to win a teamfight as long as you have a good excecution.
Late game, get yourself Abyssal blade to provide more disables for the enemy team. Use Abyssal Blade for the most annoying enemies and let your carry finish the job.
At the end, you can easily avoid being killed by the enemy. with tranquil and eul scepter you have +140 movement speed which give you easy escape. There's also 25% evasion from Halberd. With mekans and BORROWED TIME i can assure you that Abaddon will be the last man standing in teamfight. And finally, when you are nearly killed by the enemy you can suicide using MIST COIL which need much experience to estimate remaining health to be suicide.