Bug! There seems to be quite a few items added in GW:EN which display odd lighting behavior. These items appear their brightest when the sun is shining on them from behind and their dullest when the sun is shining on them from the front, as opposed to the normal and expected which is the opposite (this also happens to be physics-defying). This is an unaddressed bug.

Here's a list, though some I probably forgot or haven't found yet:

• Amethyst Aegis
• Ancient Moss Staff
• Aureate Staff
• Bonecage Scythe
• Briarwood Scythe
• Many of the Charrslayer items:
  • Charrslayer Axe
  • Charrslayer Bow
  • Charrslayer Daggers
  • Charrslayer Maul
  • Charrslayer Scepter
  • Charrslayer Scythe
  • Unsure of the Staff and Spear, sword isn't bugged, shield isn't bugged with respect to lighting I think but lacking the horns
• Clockwork Scythe
• Crescent Blades
• Darkhorn Rod
• Darksteel Longbow
• Demoncrest Spear
• Demon Fangs
• Draconic Aegis - purple gems
• Ebonhand Aegis
• Glacial Blade
• Great Conch
• Militia Shield
• Oaken Aegis
• Serrated Spear - the tail fins/fletching, the rest is normal
• Signet Shield
• Starfish Focus
• Topaz Scepter
• Zehtuka's Horn
• Other:
  • Some metal elements of Pyre Fierceshot's Deldrimor armor set