I don't see why it should be unbelievable. It looks similar to the Blinkerwall structures in the Baltic Sea which was mostly used to trap animals. Also the idea that hunter-gatherers were unable to build massive structure should be revised. See the Carnac stones for example.

Here are some changes I could think off the top of my head: 1.Hero bonuses should apply to the hero itself as well 2.The Kushite eco pyramids should have 75 metal and stone cost in p1, 10-15% less build time but reduced 10% bonus. in p2 the pyramids should be 100 stone and metal and give 15% bonus and the build time in A27. alongside this, the range of the pyramids should increase from 40 in p1 to 55 in p2 (an option to upgrade the p1 pyramid should be provided same way sentry towers become stone towers) 3.return archers to a26 state for testing right now, and see what changes are needed after that 4.make the Ostracism tech cost 200 metal 5.Reduced time for construction of Gymnasium in p3 compared to p2 (15%) 6.Increase required exp for City Guards by 15%

1250: sword and spear are similar melee units that is useful to make meat shield. 1300: swordmen is good to crack rams. 1350: if you want to go full pop attack with rams at min 13-14, an enemy with swordmen is harder to crush.  In this strategy it is common to postpone hack resistance upgrade in favor to earlier attack, but swordmen in enemy is strong in hack attack. 1400: when rushing with melee cav, run if you see spearmen, fight if you see swordmen.  I think Iberian having swormen is important to balance out the initial wall defence.  If iberian has spearmen, it becomes almost impossible to rush them. 1500+: thoughts?

Just your average 120-meter long granite block built or carved by some ancient, primitive tribe thousands of years ago. "Nothing suspicious about this, move along." - Mainstream archeology. 

Could you share the error ? According to https://gitea.wildfiregames.com/0ad/0ad/issues/8402 sound might also have been fixed by 26.2