- Neutral creatures in Heroes 3

Diamond Golems are great when you play as Tower, and if you have Fortress on the Hill as a reserve – that’s a real advantage... You upgrade Stone Golems to Diamond Golems...

But where can you upgrade Stone Golems to Diamond Golems? Maybe in Woge, but in regular versions like SoD or Armageddon's Blade, you can't upgrade Stone Golems to Diamond Golems at Fortress on the Hill!
P.S. That's why they are neutral.