So, you might think that Prince of Hell is an easy slot choice for a Hellbringer warlock- the path better-suited for Temptation warlocks and the one with more DoT options and encounter strength in general. Now look at the tooltip... It increases your armor-pen STAT by 20% at max rank. The stat, not the flat armor-pen. For me, that's a whopping.. 18 armor-pen. I'm a 10k. The average seems to be about 2k, so 200 armor-pen. Theorycrafters and everyone on the forums seem to think that 24% is what we should be aiming for, and with 2k dropping you around 20% and your armor-pen ability score (intelligence) giving at LEAST 4% (14) in almost every case (in my case, it's worth a whopping 12%). Just upgrade one dark enchant if you want that magic 24.
Now, is this ability always junk? Yes. Yes yes yes. Mhm. Always. Bypassing 2% damage resistance with that stat boost? Oh, nice! That's like a 2% damage boost, no?
Now, meet No Pity, No Mercy. On a critical strike, it gives Combat Advantage against the target; seeing as you can't stand on opposite sides of Tiamat, this is a must. Now Charisma scaling for this is unclear- with 25 Charisma, low-ish for a SW, some equations would put it around 12.5%, others 15%, and yet others at 25%. Any way you look at it, at max rank you're unloading your next round of damage after a crit with AT LEAST a 10% damage boost. That's a lot. Add that to occasional buffs from other raid members (CWs, HRs) and you're golden, with almost 100% uptime on CA! It increases with your primary (crit) stat, CHA.
Personally as a Temptation warlock, I face Tiamat with Harrowstorm, Warlock's Bargain, and Dreadtheft for my encounters, slot No Pity, No Mercy and Flames of Empowerment for passives, ignore my dailies for the most part (FoE boosts my encounters more than a daily could generally output on a single target, even TT, though this would change if I were Fury spec with double damage), and use Eldritch Blast paired with Hellish Rebuke for atwills. This build works fairly well for both stages, as Dreadtheft lets me grab aggro while standing on the spawns for the cleric phase, WB lets me mitigate damage and redistribute it, and Harrowstorm functions as my sole CC. For the dragon heads, they are all powerful DoTs in their own right and put out serious damage and healing.
A <Friendly Dragon>!
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