Hey uh... Can you not make Abyssal Mask not build out of Catalyst possibly?
######pls ignore the 2nd 'not' in the title, I done goofed and can't edit it now, I really wish I could tho' dang it.
http://i.imgur.com/aUnScBL.png/img
Having it build out of Specter's Cowl felt like a pretty dang solid tank item build path for it and by removing, the only thing Specter's Cowl builds into now is Spirit's Visage (edit: and adaptive helm, mb on that).
Another thing is it just makes it feel like another generic mana tank item with a mana sustaining passive... when by late game most champions don't even have to worry about mana issues anymore, while the ones that do can get blue buff usually on tap or have pretty large mana pool by then.
Basically the TL:DR I'm trying to get across is this - if you guys really want another mana tank based item, could you please consider making a new item for it instead first of changing Abyssal once more please?
top lane:

into AD matchups, but can't rush MR+Damage in AP matchups as you need mana to utilise
passive.
.
The last two items is always a toss up and I used to grab ZZrot or locket for the resists and pushing power but adding MR from abyssal into a comp that has AP threats was huge when combined witht hat passive. All the items i buy alreadsy have a little health so a somewhat non-squishy zyra mid-late game helps me land full rotations of spells in teamfights and thats all i need for liandrys and rylais to put in work.
and
.
Hell, I would probably skip Spirit Visage occasionally for an item like that.