isn't their stat increase a bit small? It's decent, slightly above average for a level 3 unit (but not by much), and the increase is only 4. Only the Troglodyte has a smaller increase, just 2, but it stands out in terms of strength compared to the others.
Added after 8 minutes
Ah, so the second upgrade gives a stat increase of 4, while the first and smaller upgrade give an increase of 5. An increase of 5 seems normal.
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