Upon getting 50 Fury and when using empowered attacks or Dominus, there appear to be missing textures indicated by blue boxes.
When hitting 50 fury, blue boxes surround Renekton's forearms.
Using 50 Fury Cull The Meek has a trail of blue boxes inside the swing.
When using Dominus, blue boxes swirl around inside the aura in addition to the normal sand particles.
Enabling/Disabling Colorblind Mode has no effect on the boxes (or their color).
Have not tried on lower than Very High Graphics settings.