A Marine recruit must pass their Chapter's rigorous tests and have centuries of battle experience in order to earn the right to wear the different armour suits and associated weaponry in their Chapter's inventory. These include non-powered Scout Armour (for new recruits to prove themselves), Power Armour (the most common type among rank-and-file, standard for Tactical, Devastator, and Assault Marines), Centurions (an exosuit that fits on existing Power Armour, enhancing Assault or Devastator capabilities), and Terminator Armour (formally Tactical Dreadnought Armour), with stronger armor and heavier weaponry which is often built-in, but these suits are very rare and usually only for the First Company veterans. Customized and modified Power Armour is known as Artificer Armour, and these are extremely rare and preserved after the death of the original wearer, being reserved for Marines who are heroes and/or of highest ranks. The Dreadnought, often confused as an extra-large fighting suit or robot, is actually a powerful cyborg battle walker with a mortally wounded Marine entombed permanently inside the sarcophagus. Recently introduced are the Primaris Space Marines, with their new Mk X armour being a more potent variant of the common Power Armor suits used by most Space Marines.