Fix: This is a shader cache issue. Go to Documents\Aion\ and delete the Shaders folder. The game will rebuild it on launch.
The 5.8 client sits at the peak of the ArchDaeva system. Before 6.0 simplified (or dumbed down, depending on who you ask) the skill trees, 5.8 offered a robust set of skills known as "ArchDaeva Skills." aion 5.8 client
From a technical standpoint, the 5.8 client is a sweet spot. It includes the engine upgrades that allowed the game to look modern (dynamic lighting, updated textures, and the new character creation slider system) without the aggressive asset stripping that occurred in version 6.0 to improve console performance. Fix: This is a shader cache issue