So now, I can commit a Vicious blow (2) to a Shrivelling (5) test ? And a Perception (2) to a Pilfer (3) test ? Excellent card to combine great capacities (to attack, investigate, ...) that normally use different skills !
Thematically, I'm extremely entertained by an ally that exists solely so that your investigator, exploring a spooky arcane temple, can hiss "Asps. Very dangerous. You go first!" and give the greedy tomb raider a good shove forward.
Economically, however, I agree with the previous reviewer that it's pretty hard to imagine any deck that wouldn't benefit more from another use of XP and deck slots.
If I get Interwoven Ink on The Raven Quill, and attach The Raven Quill to Old Tome of Lore, and that Old Tome of Lore is on Abigail Foreman, can I use Old Tome of Lore myself, then use Abigail's reaction ability to use Old Tome of Lore again, and then use Interwoven Ink (reacting to the second Old Tome of Lore activation) to ready Abigail and then use's Abigail's reaction ability to react to the 2nd usage of Old Tome of Lore to use it again, in order to use Old Tome of Lore 3 times per turn for only 1 action?
Might work well in Leo Anderson with Lonnie Ritter. His poor agility means he’s often having to tank treachery cards,so the extra (infinite?) soak might come in handy . Yes, the hand slot might prove awkward, but bandolier or toolbelt could be handy here.
With "The Scarlett Keys Investigator Expansion" The Hungering Blade gets quite nice new synergy support.
Obsidian Bracelet is cost efficient soak because it can tank Bloodlust. Bloodlust is a treachery and the bracelet gives soak to treachery horror.
Great synergy exists with Hunter's Armor with the "Hexdrinker (3)" upgrade. It says "Hexdrinker. After 1 or more damage or horror is assigned to Hunter's Armor from a treachery effect, you may exhaust it to draw 1 card." This compensates for the dead draw of Bloodlust.
This might be quite effective with tanky builds for e.g. Tommy Muldoon.