Jarvan's base damages are ridiculously high (Q+E does 490) combined with overly high ratios
Jarvan's QE combo does far too much damage for how much utility Jarvan gives to his team and to himself.
He reduces armor by a whopping 26% He Gives himself Armor and AS and gives other AS He gives vision of an area for 8 seconds He has an AoE slow He has 3.5 seconds of terrain that comes after a massive damage R
: 210/315 (mean roughly 260) + 230 (W level 18 base AD only)
: 260 + 240
: 300 + 240 (6 ticks a 40 damage after eating a Q)
: 220 + 250
: 462.6 + 170
: 176.8 + 373.05 (you eat half of spin-to-win's damage).
? Q 270 + slow, E 247.6 + AS slow
Or
? Q 240, W 275, as point&click with attached knock-up/knock-back
? Q 300, W 275, great AP scaling, knock-up, silence
? Q 258, E 280, point&click dash, slow/stun
? Q 340, E 200