From LSWiki

List of Hellwalkers features and explanations that I'll try and explain based on my experiences and some unfounded wild guesses.

Abilities

Demonic Abilities

Your veins pulse with shifting scarlet energy. {shifting scarlet}

• This happens rarely.
  • (Wild guess) maybe based on being really hopped up on that demonic mojo, but really, no idea what decides this.

Affinity scaling

• most stuff scales in some way off your qlippotic/sephirotic/chaos/order affinity.

Henosis damage

• is a silly combination of qlippotic/sephirotic/chaos/order/goetia that {{shifting scarlet}existentially erases} or {{shimmering}pulses}
• Your attacks do this to targets that currently have Supernal Durability if the attack is unarmed or using a lzarawn-runed weapon
  • This stops happening if you drain all of something's SD (probably)
  • This will proc on special unarmed maneuvers like chi strike, and while wearing armor that covers your hands like a void/shell/parageos/et al.
    • I haven't tested with piecemeal armour like the fire gauntlets you can get from Marius under Darkhold, but I don't see why it wouldn't.
    • The artifact axe Dyad is eligible (and amazing (and combined with The Red Plate can let you facetank Kali at level 40 while out of endurance (though that's a terrible idea that will probably destroy your inventory and you shouldn't do it)))
    • A lzarawn-runed iron greataxe (which is pretty good, though high activity cost) can load on Aldond the scary npc Hellwalker in northeast 9th floor Shadow Tower
    • I've been told the ono made by the Aligned form Hell and Heaven is amazing.

Stealing Supernal Durability

• Punching something that has Supernal Durability with an eligible attack will debuff theirs and temporarily raise yours.
  • This can stack across hitting different things.
  • {{some bold purple color}You feel your durability being further augmented by supernal energies.}
• You can only steal so much, after which you'll just have to settle with hitting whatever it is for henosis damage.
  • At 180/180/179/180 I cap out at 175 stolen from ice wraiths
  • (Wild guess) How much you can steal might also depend on what you're stealing it from. If I could punch out Cthulhu to test, I totally would.
• Times out after however long without stealing some.
  • (Guess) Hitting stuff that would be eligible while full probably extends the timeout.
  • (Wild Guess) If what you stole it from gets cleared from your kill log you lose the buff immediately. (This guess brought to you by losing supernal durability mid-fight against several dakshin, and other similar scenarios)

Passive Bonuses

• Strength / Constitution / Willpower / Perception .. Speed
• Killing eligible things can raise things based on some criteria
  • (Guessing) Asmodeans? Gods? Anything with supernal durability? Things I haven't tested because they're only eligible at lower charges than I'm willing to take time debuffing to?
• (Firm Guess) Somehow involves having them in your kill log
  • Because if you kill stuff already in your kill log they tend to persist
  • But killing stuff you haven't killed in a while tends to suck your bonuses dry real fast if they aren't in turn eligible