Dirty tricks for aquatic campaigns?

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[Lycanthromancer]

A warforged or necropolitan would be great, since they can't drown.

Taking the monk ACF to walk on water would also be a good idea.

And with that, Tashalatora suddenly becomes a viable option, so we end up with some psions, ardents, and psywars (all of which are great underwater).

Also, a psychoactive skin of proteus is incredible here (as it is everywhere else). You've got any number of forms to play with in the water, from objects that don't need to breathe (and can be used as transportation) to animals that can swim or fly (and can breathe water if need be).

[Prime32]

http://www.realmshelps.net/cgi-bin/feats.pl?Waterspawn
Mourning Mutate will do instead of Aberration Blood for non-Humanoids.

[Maat_Mons]

Check out aquatic elf, aquatic races, and races of air (they don't breathe). 

A ring of floating (Frostburn 111) costs 2,000 gp and keeps you on or brings you to the surface no matter what.  An aquatic weapon (Magic Item Compendium 28) costs 2,000 gp and removes the penalties for fighting underwater. 

Armor made from elukian clay (Arms and Equipment Guide 20) costs 1,000 gp to 4,000 gp and doesn't apply its armor check penalty to swim.  Buoyant armor (Magic Item Compendium 9) costs 4,000 gp and doesn't apply it's armor check penalty to swim.  Deepdweller armor (Magic Item Compendium 10) costs 12,000 gp, doesn't apply it's armor check penalty to swim, and lets you breathe water.  Gilled armor (Magic Item Compendium 11) costs 6,000 gp and lets you breathe air.  Blueshine armor (Magic Item Compendium 9) costs 1,500 gp and doesn't rust.  Durable armor (Dungeonscape 39) costs 500 gp and sort of doesn't rust.  The are many metal replacements for armor. 

[cru]

Aquatic crossbow (http://www.imarvintpa.com/dndlive/items.php?ID=2125) makes ranged combat underwater viable.
Druid spell Megalodon Empowerment (Stormwrack) can wild shape into gargantuan animals, such as whales (MM) or Zeuglodon (Frostburn).
Cloak of the sea (spc) gives great benefits for great duration.

Swimming races can be found here: http://community.wizards.com/go/thread/view/75882/19546874/Master_Player_Race_List_Version_2.0
(search for swim)

[Lycanthromancer]

Energy wall is a great power at sea. You can use [Fire] to create steam or to boil the sea, [Cold] to create giant blocks of ice, [Electricity] to (potentially) fry everything in the water within X feet (ask your DM), [Sonic] to deafen underwater creatures and to destroy water (and thereby sink ships), and to cockblock opponents' ships (rattle 'em apart with [sonic] or create icebergs with [cold]).

Really, there're tons of psionic powers that would be great in a seagoing campaign. Just look at astral construct.

[weenog]

Anything to make a Gate to the plane of air permanent so you can drain the ocean completely?

[Lycanthromancer]

Anything to make a Gate to the plane of air permanent so you can drain the ocean completely?

There are gates to the elemental plane of water under there, too.

Would that lead to a paraelemental plane of carbonation?

[weenog]

So we'll need conjuration to come up with incredibly large corks, too.

[Amechra]

0 LA Template known as Amphibious. Look it up.

[Lycanthromancer]

It's beginning to look a lot like fish-men
Everywhere I go;
From the minute I got to town
And started to look around
I thought these ill-bred people's gillslits showed.
I'm beginning to hear a lot of fish-men
Right outside my door,
As I try to escape in fright
To the moonlit Innsmouth night
I can hear some more.

They speak with guttural croaks and to hear them provokes
A profound desire to flee
Their eyes never blink and quite frankly they stink
Like a carcass washed up from the sea.

I wish I'd paid attention to that crazy drunken man.
He tried to warn me all about old Marsh's Deep One clan.

It's beginning to look a lot like Fish-men
Everywhere I go;
They can dynamite Devil Reef,
but that'll bring no relief,
Y'ha N'thlei is deeper than they know.
I'll continue to see a lot of fish-men
That I guarantee.
For the fish-man I really fear
is the one who's in the mirror
And he looks like me.
He looks just like me.

[weenog]

Bah, I lost my file of that song and now I have it stuck in my head.

Curse ye, Lycanthromancer. 

[archangel.arcanis]

matter agitation can boil water in 2 rounds, for only 1 PP. Boiling water deals 10d6 if a creature is immersed in it.

[Lycanthromancer]

If it helps, have some free Evanescence: http://evanescencereference.info/music/

And it's legal, if anyone cares.

[The_Mad_Linguist]

Dragon 306: Aquatic racial variant (LA+0)

Makes you aquatic.  Woo.  You can't breathe air normally, but there's an item for 650gp that lets you breathe air for a week.

[Lycanthromancer]

Aquatic air mephit?

[Maat_Mons]

Is that also from Dragon magazine?  The only things like that I can think of are an auran mask (Complete Mage 134), which lets you breathe underwater for 10 minutes for 60 gp, and a breathing mask (Savage Species 46), which lets you breathe underwater (or out of water, depending on the version) for 4 hours for 950 gp. 

[symisin]

i think it could be fun building a cold type character, ya know freezing the water with the bad guys in it 

[The_Mad_Linguist]

Is that also from Dragon magazine?  The only things like that I can think of are an auran mask (Complete Mage 134), which lets you breathe underwater for 10 minutes for 60 gp, and a breathing mask (Savage Species 46), which lets you breathe underwater (or out of water, depending on the version) for 4 hours for 950 gp. 

Same mag.  Its for waterbreathers to breathe air, not vice versa.

[Lycanthromancer]

I'd love to be a master waterbender in an aquatic campaign.

But, like, REALLY be one, not just play one on TV in the game.