Here's my attempt at a Nautilus update
P - Staggering Blow
New Effect - Heals Nautilus if it kills an enemy.
Q - Dredge Line
Cooldown Refund on hitting terrain 50%->75%
W - Titan's Wrath
New Effect - Slows Nautilus by 50%
New Effect - Enemies within 200 range are Grounded.
New Effect - Nautilus will retain the single target damage of Titan's Wrath for the full duration, but breaking the shield will remove the AOE and Grounded effects.