Interestingly enough I'm really not a fan of it. I'm going to post the current Abyssal Scepter stats followed by the new stats proposed just so other people can see it.
Current Abyssal Scepter: Blasting wand + Negatron Cape + 730 = 2440
70AP
50MR
20 flat Mr reduction within 700 units
Proposed Abyssal Scepter: Negatron Cape + Ruby Crystal + Amplifying Tome + 815g = 2500
30AP
60MR
250HP
Every 4 seconds dealing 80 (+5 x Champion level) per pulse, and reducing the MR of champions hit by 15% for 10 seconds. Stacking up to a total of 45% MR reduction
Pros:
Health that didn't exist before
MR Shred that frankly becomes massive after a little while.
Increased MR
Smaller cost items to build so the build path is technically smoother.
A little extra damage
Cons:
Less than half the AP of it's predecessor
Loses flat magic penetration
Now potentially has 3 items clogging up your inventory while you build it.
My biggest problems with this item rework is that I bought the item for the flat penetration. It was an early build on champions like Diana and Katarina for me. I frankly don't believe that Haunting guise/Liandry's Torment make much sense on Katarina or Diana, so aside from Sorc shoes it just make the most sense for the flat penetration to assassinate squishies. You could remove more than half of their magic resistance with that item due to the flat penetration. Additionally it didn't seem like a wasteful build 30 AP is virtually nothing, makes it not make a whole lot of sense for assassins any longer.
I get that tanks are more prevalent and that a magic damage version of black cleaver would be brilliant, but it's almost more of a support item now, or an item to build on Magic Damage tanks like Maokai. I frankly think it's an unnecessary rework, unless another item comes to replace it in term of flat penetration.
