It's a character perk. You can find it on the Character Perk tab of the Legacy screen. They can be purchased with in-game credits (lots of them) or with Cartel Coins.

Just because the players didn't kill him doesn't mean he's not dead. The Foundry is based around Revan planning a genocide of Imperial citizens - worse, an ethnic cleansing of anyone with any sort of Sith ancestry, no matter whether they are good or evil. Given that Revan managed to influence the Emperor during his imprisonment, clearly this plan of Revan's is born of the Emperor's counter influence on Revan. In being defeated by the player characters, Revan sees this, coming to the realization of his actions in the same manner Malak did upon being defeated at the end of KotOR, thus making Revan utter his former friend's dying words. This realization leads Revan to choose to become One with the Force rather than continue to live with the Emperor's taint. Like Obi Wan Kenobi in the movies, he does this without his body actually dying, leaving no trace of it behind. Also like Obi Wan, Revan is dead, only existing as a Force Ghost. That is the only form in which Revan should return, as it preserves his theme of redemption through sacrifice and allows the character to die in a fitting and satisfying manner. IMO, this is the only interpretation that a) makes sense and b) is consistent with the character of Revan.

The Foundry is a well crafted ending for Revan. Leave him be.

At the very least you should consider reaching the end of chapter two in order to unlock the buff. That's the best thing to unlock, especially with a BH since the added HP from the endurance is quite useful on every character.

They need a Chippendale outfit, where the guy is wearing nothing but a classy bowtie as the top and a thong on the bottom.

Surviving via a darkside ritual goes against the character's arc of redemption and is thus an unlikely outcome. Sure, it's possible, but it represents poor story-telling and is highly unlikely.

Obi Wan Kenobi didn't leave a body after fighting Vader, because he became one with the force before Vader could kill him. He is definitively dead. The same thing happens to Revan after being defeated in The Foundry. I don't think there's any other reasonable conclusion to be drawn from it, especially when he quotes Malak's final words right before he does it. After spending all that time fighting the Emperor while imprisoned, he goes a little crazy - probably because of the Emperor's influence on him - attempts a mass genocide of people with any Sith heritage and then is redeemed by being defeated and choosing to become one with the force. It mirrors his original fall, when he is redeemed after being defeated by Bastilla and her strike team. It's a pretty appropriate death, in my opinion, choosing to die to save the galaxy from what he has become. If he features in the future of the story, it'll be as a force ghost.

I'd consider quality control at some kind of alcohol production facility to be pretty important - and that might involve 2 hours of drinking.

You need to go to Tattooine. First, you need to find a vaporator with a hatch you can click on in order to pick up a buff (Refreshed and sustained, iirc, but something along those lines). Then, you need to take the egg with this buff to a set of solar panels behind the Czerka dig site. If you walk under them, you should have a pop-up message warning you about the heat. Wait until the egg hatches, and run out, as at that point, the buffs protection will have worn off. You should then have the bird in your inventory, and you can activate it like any other pet.

The Powers That Be, I presume.

I'm pretty sure he's dead in terms of physical body death, just as I'm sure he's around as a force ghost now. The point where the battle ends is definitively before Revan runs out of health. The party don't kill him. They do, however, beat him to the verge of death. When it reaches that point, the realisation of how wrong the things he was about to do (ie the indiscriminate genocide of almost the entire imperial population) were hit him, and he perhaps saw the effect the Emperor had upon him as he had influenced the Emperor. Horrified, he chose to die, to become one with the Force, rather than allow the taint of the Emperor drive him to greater horrors. He tells this to the player by quoting Malak's dying words as an acknowledgement that he was too far gone to be saved. At least, that's how I choose to interpret it until someone deciddes to try and make money by bringing Revan back from the dead.

Pierce is his nickname. His real name is Lou Tennant.

"I'm not [prejudiced against X] but.." is the surest way to spot a bigot.

Hoth is way worse than any other planets, if only because of the headaches all the whote give me.

If you're absolutely out of luck, I guess you could always try contacting here through Facebook. I found it rather easily through simply searching her name through Google, and her page lists her position at EA, so as long as you're respectful and polite, I don't see that it'd be an issue.