S tier Spider Boss in ASTDX (Image via Roblox) The S tier includes all the most effective units in All Star Tower Defense X.

If you want to use the most powerful characters, you should take a look at our All Star Tower Defense X tier list. Here are the best picks.

Our All Star Tower Defense X Units tier list ranking the best Units in this Roblox game. We also take a look at the best traits and how to get more Units.