Undead ghosts are better not only because they're more powerful
Knight Ghost is only more powerful because it only throws red axes. Just putting +Shadow on the Champion and Death Knight won't do much besides.
Indeed, I should have said explicitly undead skeleton knights.
but also because their shots go through each other.
Only if the projectiles have +ThruGhost, which can be very
easily exploited by the player. ShadowSphere turns you into a ghost, so how would you like your Death Knights to do absolutely nothing?
That's the whole point of the Shadow Sphere, and being a powerup, you won't always have it, so it's not that easy. It works as a temporary protection in Heretic. And the Death Knights' only THRUGHOST projectiles are the shards. Their ghosts have a higher chance than their solids to throw the other projectile types, but even so, the fact that the shards go through them is still noticeable.
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