Locations of the weapons that can be obtained to unlock new units, aswell as a little bit about the units.
Warning: Reading this guide may spoil your fun in finding the weapons. It's like an easter egg hunt across 3 different maps, with a prize for finding the easter egg.
Press F (by default) to enter freeroam to obtain the weapons. Once you find a weapon, by going near it, it'll start glowing. After about 5 seconds of glowing, it will disappear and award you with a brand new unit, and a new faction.
The executioner is a large axe-wielding unit. The unit is unlocked by finding an axe stuck in a tree-trunk on Medieval 1.
When the axe finishes glowing, it will disappear and you will obtain the new unit.
Mace Spinner's Maces
The mace-spinner is a fairly large unit and, as the name suggests, it attacks groups of enemies by wielding two maces and spinning around in circles with them. He is obtained by finding his maces on Medeival 2, inside a spire.
Artemis is a unit that wields two bows, and shoots several arrows at a time on unsuspecting units in very quick succession. His bow can be found on the lighthouse of Ancient 1.