The Fiendian Reptiloid Demon is an enemy in the Serious Sam series. They are ranged enemies that throw lava balls at their target from a distance.


The Demon is a large, red demon-like creature that stands up to 20 ft tall. Despite its name, the Fiendian Reptiloid Demon is actually a different species compared to the Aludran Reptiloid. The Fiendian Reptiloid Demon was originally a simple lizard-like organism from Fiendia Prime, but was mutated by Mental over several generations to create the Demon. It's one of the few immobile enemies in the game, though in Serious Sam HD, Serious Sam Classics: Revolution and Serious Sam VR it can move.


In most occurrences, Demons are placed far away from the player to harass the player while they are fighting off other enemies. They can usually be found in elevated places such as towers, roofs and pillars. Usually only one to a few appear at a time but there are instances where several of them appear, like at the end of the Courtyards of Gilgamesh and one of the Corridors of Death in The Grand Cathedral. They are much more common and numerous in higher difficulty levels.

Attacks and abilitiesEdit

The Reptiloid Demon has the ability to form a miniature black hole through which it can summon floating balls of molten lava into existence. This projectile is extremely fast, and is much harder to avoid as it will fly past the player and attempt to circle back and hit them again. Unlike the Common Aludran Reptiloids projectiles, the fireballs tossed by the Demon cannot be destroyed in the classic version of the game except by a cannonball or a few laser beams. However, in the HD and VR versions, it can be destroyed using any weapon. If the ball does not hit the player at first, it will bounce around until it either hits the player, a wall at a non-low angle or it explodes on its own.

The Demon's secondary attack is hitting the player if they get too close. This attack is difficult to avoid and deals a lot of damage.


  • The player should not try to get close to a Demon, even if the Demon is on an elevated position. When close to the Demon, the fireball is too fast for the player to dodge.
  • Generally, Demons are more dangerous in very open spaces, especially in groups, as a fireball which doesn't hit a wall comes back at player and can do so a few times.
  • While the ball thrown by the Demon is easy to avoid at medium or long range, the demon can be deadly if it is in a tight or indoor area. If it appears in one of those areas, it should be one of the first enemies killed.
  • The RAPTOR Sniper Rifle is very effective against this enemy, because it it is frequently placed in faraway locations.
  • Multiple faraway Demons can be dispatched with the XM214-A Minigun. Its high rate of fire and perfect accuracy make it a great weapon for quickly taking out multiple Demons.
  • If the player wants to conserve bullets or RAPTOR ammo, the XPML21 Rocket Launcher is effective against Demons. Because it never moves, it is easy to land multiple rockets on it in a very short amount of time. However, If used at medium or long range, at least one rocket will be destroyed by the lava ball thrown by the Demon when not sidestepping.
  • The SBC Cannon also works very well against groups of Demons; just one charged shot will kill one.


  • Despite the fact that fireballs can be destroyed in Serious Sam HD and VR, NETRICSA information still says that it's impossible to destroy the projectiles.
  • While Demons can move, most of them aren't designed to move in the original game, but in the HD remakes they will move if the situation is needed (for example, if the Demon is on the same level as Sam and if Sam tries to hide behind something that the lava ball won't hit, the Demon will adjust its position to attack you.)
  • In most cases, Demons will be acting as snipers in big battles, because while front forces attack you, Demons are usually positioned on towers very far away on the field, and since their fireballs travel extremely fast, they can accurately dispatch the player if he is not paying attention.


List of appearancesEdit

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