1 item
First item gives enough stats to engage without instantly dying.
Engage bruiser build for clean windows: Jarvan IV must be able to open a useful fight, absorb the first answer, and stay alive enough that his flag and zone still matter after impact. The build therefore cannot be a simple disposable all-in.
Jarvan plays for access, not damage. His build enables engage and survivability.
Long Sword
Proc Sheen on AA after E-Q combo engage, burst AD
Plated Steelcaps
fights extended with E+Q combo and auto-attaques stack Conqueror effectively.
Reduces incoming damage during his engages in his propre R Cataclysm.
Accumulated HP to be a tank engage difficult to eliminate in teamfights.
Healing on kill in teamfights to chain the engagements in the R.
First item gives enough stats to engage without instantly dying.