"X, crucible of death"

requires 100 kills on all pawn types. (mechanoid, humanoid, animal, etc.}

allows the item to perform a critical hit sometimes.

don't know if possible or in the plans, and i haven't really thought of a trigger( it could be mythic inspiration you get after bulding x amount of things for a couple of them), but a couple of minifiable items that you can build have qualities and could be cool to have has mythic items so a couple more ideas

god emperor throne, could give like an heddif to people that meditate at it giving stat bonus and psychic ♥♥♥♥ or an cool aura or maybe ir regens health ( many possibilities here)

an mythic table that just makes people really happy to have, since they care so much about tables and such in the rim, ok i can think of something better…(i didn't )

lazarus sarcophagus( it could become it after burying a legendary pawn on it) and it can rez one pawn in the game and then blow in lightning

midas shelf , turns anything put on it in gold or silver

super smart chess table (creative naming at its finest) gives a heddif to help in the art of war to people that play in it

lucky poker table, an ability to call an random event every once in a while or pawns that play in get lucky and get shot less

mythic chair could regen rest while you sit on it,maybe a one quality bonus to items made by pawns sitting on it

undying bed while the pawn is in the bed he can't die, he won't get better, but he wont die from the wounds.(took me a while this one) or some cool heddif to people that sleep in it

narnia wardrobe( i went deep on this one) transports the pawn whose bed it links to a magical weirdly christian reality, but nobody but the bed owner(or couple) can ” go ” there everybody else just thinks you`re crazy, in game it could just be that while sleeping they could get some varied thoughts and heddifs about .. well narnia ♥♥♥♥

paradox end table, it can randomly spawn rare items in its weird drawers

mythic sculptures, could give an aura, to help your pawns, one to make raiders insane or sad, making traders give better prices while in range, recharge shields faster( here i could ramble for a while)

Not exactly an idea for a title, description or ability, but related to how they're earned. You've mentioned you're not sure about how and if you want the thresholds to change when skills can exceed level 20. How about not deciding yourself, but adding an option menu to the mod, that lets users decide the thresholds themselves ?
I say that assuming it would not be hard to create such a menu. If it would require massive rewrites to your code, then it would be best to ignore the suggestion, or at most keep it for later.

In other suggestions, back to your regularly scheduled ideas.
Is there a way to know how many other pawns a pawn has knocked out but not killed ? If it is possible, maybe enough non-lethal knockouts could give a Merciful mythical title that makes a weapon less lethal and more incapacitating ?

laser blast

a cool one , pawn got x amount of bonded animals in his lifetime, the effect makes bonded animals of the wearer stronger

Guiding Angel (weapon, ranged): increases accuracy and decreases aiming time and cooldown. Also narrows forced miss radius if present.
Guiding Angel (weapon, melee): increases armor piercing and decreases cooldown.

What do you think about making a weapon of apparel unbreakable? No increased stats, but it's absolutely impossible to destroy them (unless using 'destroy')

@speedentron Probably not sorry. That'd would actually be shocking tricky to pull off, given how I designed the framework. There's only a few injection points for mythic items to add new behaviors, and none of them lend themselves to permanently altering a fundamental property of the item, which is what you'd need for indestructability.

Would it be possible to make a mythical item self-repairing then ?

@The Almighty 404
That would still require new interactions, but would certainly be easier.

I don't know if this is possible but I hope you can consider this suggestion of mine 😉 and I also commented this on Reddit:

"Duster of the Desert Wanderer" - achieved by wearing the same duster for n quadrums in a desert or extreme desert biome. It gives a random combat bonus (e.g. melee dodge chance, or aiming time, etc.) while in a desert or extreme desert biome.

"The Juggernaut" - achieved by downing/killing n enemies consecutively using a longsword without the wielder getting downed (the down/kill counter resets to 0 whenever the wielder is downed). It gives the go-juice high buff when drafted to the person that achieved the feat (the weapon will be automatically bonded to the wielder, the weapon acts like a persona weapon in which it can only be used by other pawns if the wielder dies).

"Mogul Kahnt Touch This" - achieved by downing/killing n enemies consecutively using a Battle Axe (Vanilla Weapons Expanded) without the wielder getting downed (the down/kill counter resets to 0 whenever the wielder is downed). It gives the go-juice high buff when drafted to the person that achieved the feat (the weapon will be automatically bonded to the wielder, the weapon acts like a persona weapon in which it can only be used by other pawns if the wielder dies).

Requiring Vanilla Ideology Expanded - memes and Structures:
"Zantetsuken, the Iron Cutter" - achieved by killing 20, 40, 60, 80, 100 enemies wearing armor with armor sharp value ≥ 65.7 using a Shintao style longsword. It increases the Armor Penetration (AP) value in five tiers (depending on the number of kills) capping at 95%.

"Inazuma, the Lightning Strike" - achieved by instakilling n enemies (in five tiers) using a Shintao style longsword. It decreases the weapon cooldown of the weapon in five tiers (depending on the number of kills) capping at 0.5 seconds.

"Zangetsu, the Moon Slayer" - achieved by killing n enemies (in five tiers) at night using a Shintao style longsword. It increases the Melee Hit Chance at night in five tiers (depending on the number of kills) capping at 95%.

Requiring VFE- Classical:

"Spear of Belisarius" - achieved by surviving n consecutive raids using a spear and also wearing the Centurion armor set (Centurion Helmet and Centurion Armor). It bestows the Combat Command Ability or just increases the effect of the toggled ability Formation (the Formation Ability is attached in the Centurion).

I'll try to keep it simple. and hope those ideas are easy to implement:

Bloody (Clothing) of the Butcher - Colonist slaughtered X Animals. could increase damage against animals, or the meat gained from slaughtering them

Donner Party (Clothing) - Colonist Slaughtered X Humanoids. same as above but humans.

(Weapon), Pirates Plight - Wielder killed A LOT of Pirates

The Alien Slaying (Weapon) - Killed X ammount of humanoid Aliens (if we integrate the Alien mod to this)

(Colonist)'s Stone Age Ender - Killed X Tribals

(Colonist)'s Cyberware (Clothing/Weapon) - Colonist gained a lot of Bionic Implants - Weapon deals EMP damage (EMP weapons get increased damage)

(Item) of the Archon Apostle - Colonist got all Vanilla Archon implants (legs, arms, and eyes)

(Clothing) Of the Heroic Rescuer - Colonist Saved a lot of people from bleeding out.

(Colonist)'s Vetrinarian (Clothing) - Colonist made Steve Irwin proud by saving animal lives.

a little bit to fantasy like, but getting like an epic mythic achievement could give a sword like the Rimcallibur with cool powers and maybe an ranged orbital beam , an ability for the true king of the rim

(Colonist)'s (Clothing) of the Archotechnician - If the pawn has 20+ crafting and high enough medical (arbitrary number) it will get applied. The effect is when creating bionics, the pawn wearing it has a chance to instead turn the bionic into the archotech version of it (if it exists).