Sustain (like greaves, octarine), mobility (blink or force), push (necro, aether lens, etc)
Aghs is like semi decent but building it first is absolute nonsense, you won't do shit with it
I would rather get Refresher on Pugna than Aghs honestly
If you go lategame and have Shivas, Sheep and Refresher you can dominate fights
Also 2x Nether Ward is fucking HILARIOUS, especially vs INT heavy teams