[Endoperez]

It's almost possible for the bigger Agarthans to punch through the shields of medium enemy infantry. Shields have protection 15, and bigger Agarthans have 18 str (and usually Spears, 3 dam), so they have about 50% chance of dealing 1 or more damage to someone with protection 6 before shield. It's not enough to balance the odds on its own, but with Legions of Steel and/or Nature 9 and/or low-level Blood bless they might be able to deal damage to medium infantry with shields even if the hit is parried.

The smaller Agarthans aren't good at killing your enemies, but they ARE good in slowing them down. For the price of a human, you get twice the hitpoints on an amphibian that doesn't consume supplies and has a siege bonus.

I just realized that Agarthans also suffer from poor choice of weapons. They use normal-sized Spears, but their attack is too low to Repel with it, and which has too low damage value to emphasize their own high strength.