Abaddon can be a reliable support or carry depending on the situation. With his incredible survivalbility and spell-countering shield, he can turn the tide of any fight by being in its presence. As the guide states, upgraded boots are bought by choice since his passive can provide all the ms and atk spd he needs. Vlads and Blademail are to be bought as early as possible, to maximize team and your own survivability. Few supports items are needed, Scepter and Crimson u can block almost all damage.