Predecessor Builds > Riktor > Anti Grux

Build Order:
1. Brimstone to Fire Blossom
2. Tainted Guard to stop that Grux life steal.
3a. Timewarp if ganks aren't bad and you can do without the magical armor for a bit longer. The boost in CD, Magical Power, and Manag regen are super useful.
3b. Tainted Bastian if ganks from JG and MID are hitting hard.
4. Timewarp if you went with Tainted Bastian.
5. I like Spell Breaker at the end. When the ults are flying the extra shield and damage passive can be useful. Plus it give you a little more magic power and armor if the mages are being a pain.

Don't forget to pop Saphir's Mantel for the health gains. Void Helm and Flux Matrix are always good alternatives for that extra magic armor. Dynamo is good if you need that extra physical armor and CD.