Help with Troll Blooded

[Clanjos]

Right, my DM okayed troll-blooded. However, he's also made it so it's impossible for dead souls to leave the plane, for clerics to communicate with gods, or for anyone or anything to travel between planes. Even the ethereal, Astral, and Shadow planes are cut off.

I'd like to show him just what a truly immortal adventurer can do. He's left the 3rd-level party in antimagic shackles, but the rogue still has her gear. I call this a "Payday." We've agreed everyone gets at least one 7500 gp share of the profits from the sale of the shackles.

My question is this- for a preferred price of 7500 gp, with a DM who allows custom magic items, is there a way for me to become immune to fire and acid (which overcome Troll-Blooded's regneration)? What about non-lethal damage and death effects?

Build is Totemist 2/Warblade 1, though open to changes.

[Maat Mons]

The mantle of the fiery spirit spell (Sandstorm, p118) gives the target the fire subtype as an instantaneous effect.  It's an 8th-level spell, has a 5,000 gp material component, and costs the caster 2,000 xp.  That would normally put the market price at 27,000 gp, but you could use one of the options from this article to foot the xp cost yourself, bringing it down to 17,000 gp.  If there's a high-level NPC friendly to your party willing to cast spells for you, you might also be able to eliminate the standard spellcasting fee, bringing it down to 5,000 gp. 

A custom item based on the spell energy immunity (Spell Compendium, p80) would cost 66,000 gp, which is even worse. 

If you're willing to give up levels for this, the Imix-blooded template (Monster Manual V, p65) gives you immunity to fire for +1 LA, and tainted-blood template (Bestiary of Krynn, p97 or p98) gives you immunity to acid damage for +1 LA. 

The gheden template (Dragon 313, p63) gives you immunity to nonlethal damage for +1 LA.  That's about all I can find on that front. 

The cheapest way to get immunity to death effects is soulfire armor (Book of Exalted Deeds, p112).  That's a +4 ability, so you're looking at at least 24,000 gp to add it to armor. 

[phaedrusxy]

I'd suggest going with high resistance and the +1 Death Ward armor ability (which is once per day as an immediate action) instead. A CL 11 wand of Energy Resistance (made by a  ranger or archivist) would cost 8250 gp, and provide resist 30. For two charges, it could be against both types.

[Arz]

Diehard or similar gives effective immunity to non-lethal. So shape rageclaws.

[Maat Mons]

The interaction between diehard and nonlethal damage is incredibly poorly though-out.  As written, there are two completely separate conditions that make you fall unconscious.  One is having your current hit points fall below 0, and the other is having your nonlethal damage exceed your current points.  Diehard removes the former, but not the latter.  So, RAW, if you have diehard, are at -1 hit points, and you're suffering from 0 points of nonlethal damage, you're unconscious, because your nonlethal damage (0) exceeds your hit points (-1). 

Now, since that's patently ridiculous, I don't expect a game would ever be run that way.  What I would expect instead, is that nonlethal damage would be added to regular damage for purposes of determining when a character is staggered or unconscious.  So, if a character has 10 hit points remaining but has suffered 20 points of nonlethal damage, he'd effectively be at -10 hit points for purposes other than dying.  If you look at diehard, it says you can remain conscious between -1 and -9 hit points.  Since -10 isn't in that range, but it is below 0, our example character is unconscious even if he has the feat.