Age of Strategy Forums

Manica: anaarmguard developed to fight against falx armed dacian warriors to give more protection to legionaries
Cost 4
Armor +1
Only affects legionaries

Spatha: sword used commonly by roman cavalry but adapted by roman infantry at mid/late empire
Cost 4
Attack +1
Onlyaffects legionaries

Lorica hamata: an adaptation of celtic mail armor used at early days of republic, replaced by lorica stagmata, but used again at late empire. Description say that was used by centurions pretty often
Cost 7
Armor +1
P Armor +1
Affects auxilia/legionaries/centurion

This could replace the idea of making roman units affected by blacksmith upgrades
Info and details extracted from wikipedia

i think adding surgical i9nstruments and a roman healer called "physician" could be a good idea, being "surgical instruments" a tech to improve the heal rate of physician
https://en.wikipedia.org/wiki/Medicine_in_ancient_Rome

new roman tech: torsion engine
cost 5
effect +1 attack
affected units: ballistae, scorpion (if this is implemented)