This build will help with early and late game encounters. If played wrong its unforgiving.
Use Ossein Renewal along with Drain to stay in fights longer.( must be used together )
for Ultimate it can very for situation.
Entomb = Great for stopping auto attack players such as Valla, Tychus, ect. or pesky melee heros.
March = Excellent for destroying buildings and clear a path for your team during team fights if you have the right support that can capitalize off your ultimate. If not you are dead where you stand.