Crusader

The Crusader is a Tier 5 Beta Tank found in the beta tanks page that will supposedly upgrade from the Fighter, due to it's appearance, &/or the Chiller or Acid, based on abilities. It is a Fighter with chill and poison effects.

Design
The Crusader looks like the Fighter, besides the fact that there are chartreuse-colored squares on it's side cannons and cyan-colored squares on it's thruster barrels. It likely has the same glow as other double-effect tanks such as Frostbite and Hypothermia, consisting of the Chill and Acid glows stacked on top of each other to create a unique green aura.

Technical
Literally it's just the Fighter with effect damage. Its side barrels inflict Acid and its thrusters inflict Chill.

Upgrades
While we don't actually know for sure, this thing may upgrade from the Fighter. We do know it won't upgrade into anything.

Strategy
There are no valid strategies for the Crusader as it hasn't been used enough.

Trivia

 * My boi Thulium the 69th element had this idea.
 * By Google definition, a Crusader is a fighter in the medieval Crusades.