Having blue glowing minions may help distinguish them from other skeleton enemies, but I never had any problems seeing the difference in D2. I get the whole “this is the Necro’s power” aesthetic, but IMO it doesn’t match the realism of the game’s surroundings. Bone skills – take the glow off. Minions – take the glow off, etc. They would look SO much better without it, and immersion would be heightened.