Looking for suggestions to fight Land-dwellers suddenly immersed in water

[Sonicmixer]

So we're a few sessions into a new game, levels 1-20 in 20 sessions, and we've loosely recreated a group called the Akotski from the anime Naruto. I've created the character Kisame for those who are interested/familiar with the series. Our GM has given us all 1 special ability to further help us recreate these characters, so to the point.

I'm an Aquatic Orc who's an Invulnerable Rager. The special ability I've been given is what allows me to travel around on land without suffocating. I basically carry the water around with me (10 cubic feet / Character Level magically compressed inside me), though in the roleplay I do look for sources to replenish it quite often. As a full-round action I'm able to unleash the water into a bubble around me forcing any enemies we're facing to fight me underwater. I can do this roughly once per week, the bubble can follow me, and lasts for 1 round / character level + con mod. After its over I've got just enough water to survive, but am pretty dehydrated and vulnerable till I find a new source of water. (I'll need to double check that duration with my GM).

I am pretty much the only melee fighter so I'm trying to make this guy rather tanky but still able to put out SOME dps.

My question is what feats, rage powers, gear etc would help help me take advantage of putting enemies in my natural element to fight? I've got a few ideas already, but any and all suggestions are welcome.

Thanks

[Sonicmixer]

*Bump*

I've been thinking of ways to take advantage of my enemies suffocating around me, so I've been looking for ways to inflict Con damage. So far I've only really found the Rod of Withering, which isn't a bad option, but I was hoping for something that fit my character a bit better.

Are there any other options for Con damage? Ideally I'd love to infect my water somehow with something that on a failed save does Con damage to an enemy for them just being in it, but that'll probably be a GM call.

[Irthos]

I think the name you're looking for is Akatsuki.

Drowning can take awhile, so you'll need a strategy for keeping your opponents in the water long enough to have an effect. I'd recommend grappling, since it does triple duty: you're immobilizing and damaging your opponent, and every turn they try to escape counts as 2 rounds of holding their breath.

At your DM's option, you might be able to speed things up even more by making grapple checks to squeeze the air out of your victim's lungs. With Improved/Greater Grapple and Rapid Grappler, you can potentially wring an extra three rounds' worth of air out of your opponent every turn - that's four rounds' worth total, or five if they struggle.