Partha: The Ageless Empire.

[Sombre]

How is that reason for a bump? If anything that's a reason /not/ to bump, unless you're very shortly going to have something.

[Spendios]

Some unit suggestions :

light camelry : bow/spear bonus against cavalry
camel cataphract : spear/mace bonus against cavalry
elephant : used by parthians and sassanid
heavy slinger protected with helmet and shield
winged lion : symbol of parthia
mounted crossbowman cataphract : used by sassanids