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In my opinion, the 4th-tier unit in the Fortress is an alternative without any real alternatives. I think Titans are much better; they are both ranged and melee units, and the Amulet of Chaos, although a very specific bonus, is quite useful. As for Dragon Golems, I only build them when I feel like it because I like the idea of a mechanical dragon, and the Absolute First Strike ability is also original; no other unit has that. However, as a unit for hire, I don't know, I feel like something is missing. Yes, the first strike is great, but it can't fly, so it has to reach the enemy, and all sorts of obstacles and slowdowns, like quicksand, get in the way. It does have resistance to magic due to its mechanical nature, but the Bone Dragon also has immunity to mind control. And in general, as a mechanism, it's only effective against undead. Aging, fatigue, poisons, and vampirism don't work against mechanisms, but against other races, I think it's quite weak. In the Campaigns, there's so much hype around them, and some cool Red Gnomes and Black Dragon skeletons are built, but in the end, it's just some cockroach running around the screen.