This patch is a contribution by real_tabasco_sauce, cf.
https://gitlab.com/0ad/0ad-community-mod-a26/-/merge_requests/27
Summary
Added some cool centurions. Actors were already existing. This branch allows rank three swordsmen to be upgraded at a cost of 100 food 50 metal into centurions. Centurions are the strongest sword champion in the game, but you can only get 8 of them and they are hard to get.
Rationale
could be OP. Potential nerfs: decrease HP to HP of rank 3 swordsman, decrease attack to that of a normal champion, increase upgrade time, nerf the aura.