There are four types of Power-ups scattered around Nosgoth: Aftifact pieces, Max Glyph point diamonds, Glyph point pick-ups and Glyphs.
Artifact Pieces:
These look like floating, glowing pie/pizza pieces. 5 of these will
increase your energy meter in the real world only.
There are a total of 15 to collect. That means you can increase your
energy meter three times. These are availible in both the Meterial relm
and Dead Realm.
Max Glyph point diamonds:
Very rare and even more valuable, each one gives you about ten (I think)
Glyph points.
Glyph point pick-ups:
These look like glowing blue orbs, small ones give you one Glyph point,
big ones give you four. These pick-ups are quite common and only appear
after you get a Glyph. These are so common in fact that it would take to
long to write down where each and every one is.