Crusader

The Crusader is a Tier 5 tank that upgrades from the Fighter. 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. unlike other double-effect tanks such as Frostbite and Hypothermia, Crusader has an all-green glow.

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

Upgrades
The Crusader upgrades from the at level 60. It does not upgrade any further.

Trivia

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