From LSWiki

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

Features

Demonic Abilities

• I'm fairly certain this explicitly marks you as having demon blood, but haven't bothered to check.

Life Save

• {{shifting scarlet}Your veins pulse with shifting scarlet energy.}
• on death get fullhealed and teleported somewhere instead, like Sea's Blessing or a no concept nav Phoenix Rebirth
• I've only seen this a couple times and have no idea what decides if it triggers

Affinity scaling

• stuff scales in some way off your qlippotic/sephirotic/chaos/order affinity
• how much SD you can have stolen from stuff
• passive bonuses from killing eligible things

Henosis damage to things with Supernal Durability

• is a silly combination of qlippotic/sephirotic/chaos/order/goetia that {{shifting scarlet}existentially erases} or {{shimmering}pulses}
• if whatever it is has all its SD drained out then you go back to doing boring damage
• requires the attack to be unarmed or using an eligible weapon
  • Dyad is amazing. Heals onhit when hitting something that has SD or would charge passive stuff on death, and does the damage of a greataxe with double the armor pen and half the activity cost.
  • the lzarawn-runed iron greataxe that can load on Ardlond in Shadow Tower is mediocre.
  • I've heard that the special ono made by the Aligned form Hell and Heaven is really good.
  • Unarmed attacks including fancy limbs other than arms count, and don't care if you're wearing something over that limb. (though unarmed scaling weapons like claws don't count)

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.
• You can only hold so much stolen SD, after which you'll just have to settle for doing henosis damage.
  • How much scales with your affinities
• Occasionally leaves unexpectedly soon
• Might be extended by punching things that have SD

Passive Bonuses

• Strength / Constitution / Willpower / Perception / Speed
• buffs go up upon killing something eligible while not at full charge
• buffs go down upon killing unrelated things
  • I'm fairly certain this is happens when the contributing thing gets kicked out of your kill log, but that's not feasibly provable.

Buffs

    You are a competent second-degree possessor of supernal durability (37),
though you appear to be effectively functioning at an amazing level (252).

    Your speed is very fast (68).

/---------------- Attributes of Honoka -----------------\
| Attribute     Natural               Effective         |
>-------------------------------------------------------<
| Strength      Good         [  61 ]  Unearthly [ 211 ] |
| Intelligence  Amazing      [ 150 ]                    |
| Constitution  Very High    [  80 ]  Unearthly [ 230 ] |
| Dexterity     Incredible   [ 130 ]                    |
| Willpower     Unearthly    [ 270 ]  Unearthly [ 450 ] |
| Charisma      Unimpressive [  40 ]                    |
| Perception    Prodigious   [ 110 ]  Unearthly [ 260 ] |
\-------------------------------------------------------/

Guesses

Regarding passive buff charging (and why it's based on kill log tracking)

• Killing stuff that's probably already in your kill log tends to leave the buffs intact, no matter how not-demons the things are.
  • I've gone days of just killing stuff in an inefficiently small rotation without losing buffs
• Killing random stuff you haven't killed in a while tends to suck your bonuses dry real fast if they aren't in turn eligible (and sometimes even if they area)
  • If I intentionally kill a big pile of random stuff to kill my clear log, I end up with a couple false starts having to re-get buffs before they stop fizzling out the moment I start xping

Regarding stealing SD

• How much this maxes out at varies based on some things other than your affinities
  • I'm fairly sure it's related to what you're stealing from.
• I suspect in addition to having presumed time-based timeout, there are kill log related shenanigans
  • I've had the SD buff time out nonsensically fast after stealing it.
  • Usually immediately after killing something (e.g. sucked max I could hold out of a dakshin, killed it, killed the buff 15k xp dakshin without leeching any from it, immediately lost SD stolen 4 rounds prior.)
  • Might just be bugged, might have a randomly random timeout timer.

Regarding getting buffs from killing something

• some stuff might have more 'value' than other stuff
  • I tend to cap out at 64 speed off the easy ygelyeku/oni/whatever, but if I can take out the balrog the buffs usually tick up a bit higher, and for one inexplicable day was up to 77 resting speed with no external buffs