[XG] Ability to do anything with ammo, weapons and artefacts
XG can be used to alter (i.e add or remove) the player’s health, armour and keys in various ways and all can be requirements (i.e. line X won't activate if the player doesn't have a blue key card and more than 150 armour).
However, there is no similar set of functions for ammo, weapons (including HeXen weapon pieces) or artefacts. XG can't alter or use any of these as a requirement at tall.