Advance
Tradition of Payment
It is always tempting to be a little late paying soldiers of fortune — after all, you never know what sudden expenses might come along. But we will not do that; we shall pay our mercenaries exactly on time, and mercenary captains will know this and remember this.
Advance tree
The game files don’t say where this goes: it has no requires, so the game places it in the 
Discovery tree itself.
Modifiers
Mercenary Size+33%