Now, I'm not a Nautilus, but I do play him a decent but and enjoy him, but now these changes on the PBE have made it to pure nerf levels.
Titan's Wrath (W)
Shielding changed from [65/70/75/80/85 (+9/11/13/15/17% maxHP)] to [60/70/80/90/100 (+9/10/11/12/13% maxHP)]
Duration lowered from 10 to 6
Cooldown lowered from 18 at all ranks to 12 at all ranks
Cost lowered from 80 to 60
[Nautilus has other changes in testing on the PBE!]
Titan's Wrath (W) cost reverted from 60 to 80
Now the only benefit from these changes is a 6 second CDR reduction. Everything else is a nerf.
Riot please, you wanted to make tanks 'viable' again, this is the opposite of what you're suppose to do.