The Highlander is a large four-handed bipedal reptilian creature that has agreed to work for Mental in exchange for magical powers. Highlanders are more dangerous than Commons, not only because of their large size, but because they also have much more health, deal more damage and will be enraged when below a specific amount of health, causing them to shoot 6 fireballs per "burst" instead of 3. They are also much faster than Commons, and they can catch up with the player even if they spawn far away.
Highlanders are very rare in The First Encounter, only appearing alone most of the time. They appear in the Valley of the Kings (one, as a boss), in the Moon Mountains, Dunes (on higher difficulties), and The Great Pyramid (in cooperative and higher difficulties). In The Second Encounter, they are rather more common, and they can appear even in groups of 2 on higher difficulties. There are 3 (In single player) or 6 (in co-op) Highlanders in just The Grand Cathedral. They usually spawn away from the player and start walking towards them while constantly shooting magical fireballs.
Highlanders have 2 attacks: shooting a burst of fireballs at the player and punching him/her. They will shoot around to 3 fireballs normally, but when enraged (when their HP is low), they will shoot much faster, and around to double the amount of fireballs. Their fireballs have weak homing abilities, but will explode when impacting with a surface or wall, unlike their Common counterpart's energy balls. Their punch is very deadly and can kill the player in one hit on higher difficulties.
- In TFE (Classic), Highlanders' fireballs have the same characteristics as that of the Common ones—they won't bolt straight at the player but will travel in a slow, spinning trajectory and can take sharper turns. This can actually make them difficult to destroy and/or dodge due to their sheer numbers, especially when the Highlander's health is low. They can however also be shot down by any weapon, just like those fired by the Commons.
- Constantly strafe in one direction when facing a Highlander Aludran Reptiloid. The Highlander cannot hit you as long as you are constantly moving. These tactics, however, might not be very effective in Classic version of The First Encounter — you just need to get rid of it as fast as possible.
- If you need to change direction while dodging, switch direction as soon as a fireball hits the ground. The delay between the fireballs, even when it's firing them fast, is large enough that you can switch directions without having a fireball hit you while you're changing direction.
- Bombarding the Highlander with a XPML21 rocket launcher works well. Just face the Highlander and hold down the fire key, and the sheer number of Rockets fired will eventually overwhelm the Highlander, even if a few hit the Highlander's fireballs instead of the actual Highlander.
- In TFE (Classic), the Minigun might be the best choice for taking down a Highlander when available if you got the bullets to spare, as you can shoot down all the fireballs when they're fired and keep it under constant fire.
- Never let a Highlander get too close to you, as its melee attack is very powerful and has a long reach.
- Highlanders should be medium-priority targets among other dangerous enemies, such as Majors or Fiendian Reptiloid Demons. If they are very far away, their projectiles are easy to dodge. Nevertheless, they should be higher-priority targets the closer they get.
- In TFE Classic, however, they should be considered very high-priority targets due to the homing capabilities of their fireballs.
- In TSE Classic, they are very resistant to cannonballs.
- Highlander's Bride — the largest and the most dangerous variant of the Aludran Reptiloids.