Thanks for the updates! Looking good!
Arcanum Greaves
Thanks for the bump to +2, which was feeling very lackluster. I would swap the text to say "3 Damage Resistance except to Eldritch and Push damage" so it applies to non-Eldritch traps and effects, and in that way is not inferior to lesser Greaves (or other items) that might provide protection.
Arcanum Ring
This is now an exciting item. I think you mean "+2 to all Ability Scores".
Mark of Enlightenment
Two suggestions - and this coming from someone without a dog in the hunt as I am not mid-journey to a $5000 (or $32000) investment to craft this token.
1. I would make the power granted by the token very cool. Don't dog it. People who invested in the time and money in this token are devotee.
2. You asked "How do you lend out a tattoo?" I don't think you do, but I think you should be able to transfer it in a magical ritual that has some costs.
To this end, I recommend creating a transmute recipe called "Transfer Mark" that allows you to transfer the Mark and Soulforge it to a new owner. Consider it an arcane ritual. The ingredients include the old Mark of Enlightenent and Transfer Mark ingredients (which I would not make overly onerous), and in return TD would issue a new Soulforged Mark with the new owners name.
This prevents frivolous lending of the Mark, preserves the integrity of the "soulforged" concept, but also protects the investment of the owner of the Mark. Also, I strongly endorse the idea of generational transfer of token collections. My young son is already asking me when he can play, and if I were to own such a Mark I would want to pass it down.
Incense - I will reiterate that I would alter the artwork between these tokens much more significantly (e.g. incense sticks, incense brazier, pile of incense, incense candles, go for it). I do like the Censer a lot.
I do rather like the new completion tokens, including the names, designs, and powers. Nice.
In terms of the crossbows: I am assuming the Very Lethal Crossbow is the progeny of the +2 Darkbane Crossbow, which does 2X base damage vs. Undead and Were Monstsers, and that either this or the Assassins Crossbow is an ingredient? If so...
1. I really like that the Darkbane Crossbow is usable by all classes.
2. I would rename the +3 relic a +3 Darkbane Crossbow and change the wording to "+3 damage vs. Undead & Were-monsters. 3X damage to all attacks on Crit."
3. For the +4 Legendary, I would preserve the above, and add 19-20 Crit.
I don't min/max crits so admittedly that might be overly tuned, but 3X crit multiplier on just the 1st slide when you need to roll or slide the crit seems weak for relic.