Faceless Void is a hard carry that has a respectable timefight presence in the early game through the use of his ultimate, Chronosphere. The Armlet-Mjollnir build for Void focuses on building cost-efficient items in order to come online earlier than a Battle Fury Void, letting him push early with his team.

Update: This is an outdated and inefficient build, but not deleting it because I find it hilarious. A much better item build would be:

Power Treads > Mask of Madness (MoM) > Mjollnir > BKB > Daedalus > Butterfly > Boots of Travel (sell Power Treads). [Not including new 6.84 items, haven't figured out how usable they are yet.]