Alright, so my bf and I did some testing tonight.
Last night I had this random disconnect and had the NGS error but turns out it wasn't related to Abyss.
However, when I restarted my client, I had crashed about instantly after talking to my spirit weapon and hovering over an inventory item to give him.
I turned off True Dura/Colour and Ego Desire and now I'm working just fine without crashing. I told my boyfriend it was probably stupid to assume that it had anything to do with Dura, because diamonds don't have durability anyway! So he went and shut off his Ego Desire but left Dura/Colour on and he's working just fine. (:
I just wanted to point out that Ego Desire is causing me a weirdo crash issue!