1. Spectre- I thought that the Spectre could be implemented as a monster with identical properties to the Demon, but represented by a blank space, rather than a letter. This would give it much the same effect as the spectres in Doom; they are actually quite visible if you're paying attention, but if you're distracted by other enemies in the same room they can sneak up on you and get right in your face.
2. Invisibility Artifact- I'm reasonably certain this has been brought up before, but it could simply give the player a much higher dodge chance for the duration of the effect, like around +30%, so Hellrunner specialists don't become literally unhittable with it
Another possible feature is one I picked up from playing a Doom mod: if you're not actively attacking anything, after a few seconds they become unaware of your presence, allowing you to sneak past or get the drop on enemies. This would be very handy for berserkers and shotgunners.
Just to clarify, after attacking you do become partially visible, and can thus be attacked, albeit with the increased dodge chance.
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Topic: Spectres and the Invisibility Artifact (Read 2348 times)