Combining champion's to the death and hard to kill, a fighter i just created has to take 60 points of damage in order for him to die. And he can act normally through all of his -42 hitpoints, without loosing any, being immune to bleed of any kind.

I don't know if i just pierced a hole, or is this supposed to be like this.

And this was Tier1 Level1 character mind.

Imagine a Dwarven barbarian with 20 constitution at level 1 with "To the death", he'd have to reach -60 to die, and would have at least 17 HP to start with while not raging, additionally he could rage and have to hit -72 to die, yea that's a pretty hard to kill first level character.

17? try 20+ I have 18 hitpoints with 14 con.

There's not much reason for toughness or putting your favored class bonus into HP if you have to reach so far into the negatives to die.

At least not at first level.

EDIT: Of course my example barbarian forget to add the +5 hp from champion, so it'd be at least 22 HP.

Guess which ability score gets the increase after reaching 2nd tier...

20th level Barbarian/10th tier Champion

Constitution 46 (20 + 10 mythic +5 inherent +5 levels +6 enhancement) allows him to survive to -138 hp. And he can have 12+19d12+470 hp (he spend favored class bonus on hp and got Toughness and Mythic Toughness). Have I missed anything? Aside of potential +2 profane bonus to Constitution from a friendly succubus?

EDIT 1: He also has 28 mythic power.

EDIT 2: Also, with one feat allowing picking another path abilities he has DR 15/Epic which increases to 25/Epic while below 0 hp. Regretfully only opponents who don't run away from you at the very first sight of you are very mythic opponents with ability to penetrate DR/epic even when sleeping.

So basically, 605 (Average mind) and can go to -138. Which is 743 points of damage.

So basically, 605 (Average mind) and can go to -138. Which is 743 points of damage.

Does this adjust up for when he rages?

Yes. Those are "cold" hp without morale bonus to Constitution for rage calculated. Greater rage would give additional 80 hp.

Temporary Constitution bonus does not increase death threshold, however, so it stays at -138.

well, I'm not shocked, you take the highest HP-class, to the highest level and highest Tier, using feats/powers ; and you get 700 HP.

how long will you stand VS a fighter 20/Champion10 optimised for damage ?
(of course he has an epic weapon)

Fighter wouldn't be too far away with HP either. Around 450+ with at least a -100 to go before dying.

There's not much reason for toughness or putting your favored class bonus into HP if you have to reach so far into the negatives to die.

At least not at first level.

EDIT: Of course my example barbarian forget to add the +5 hp from champion, so it'd be at least 22 HP.

I dunno. Mythic Toughness seems pretty ideal for the Level 1 Tier 1 Mythic with To The Death--true it barely gives you more hp, but since you're mainly using your massive buffer of negative hp as health, the DR 10/epic is going to be ridiculously handy for a level 1 character to have.

Not sure I see the big problem. Okay, so he's got further to go before he dies. But guess what? He's probably a lot more likely to die, because instead of having the luxury of falling unconscious (during which his allies go "oh crap!" and heal him), he instead keeps on truckin' until he falls stone cold dead.

Sure, it's powerful, but is it really more powerful than, for example, the ability to turn all 1 min/level spells into ALL DAY spells or the ability to turn all 1-3 level spells into at-will spells?

Sure doesn't seem like it.

About To the Death: the way I read it, you can go negative until conx3 and take no damage when performing standard actions at negative hit points. BUT it does not change the fact you're still disabled (staggered) from passing the 0 hp mark.
Taking that into consideration, the power is strong, but not too strong, I believe.