[quote=ASTA]
A military comprised of highly-trained soldiers clad in 'outdated' steel armor that utilize powerful shoulder-mounted ballista, with said ballista firing bolts that possess tips laced with unstable solid and chemical explosives that detonate on impact with a target.

 In a 5th century RP.
[/quote]

ASTA makes a valid point, I'm afraid. That does seem a bit far.
If you need pointers for armour, remember that Roman Armour was made of a mix of steel, iron and bronze plates overlapping each other. Steel was really expensive in those days, though, so it might be worthwhile to buy iron or bronze armour.
And the shoulder mounted ballistas with explosive tips - no. Crossbows with normal crossbow bolts, yes, but not shoulder-mounted ballistas, and NO explosive arrowheads.