Pixiv tags suggest there's a reference to SCP-173 here.

genshou said:

Pixiv tags suggest there's a reference to SCP-173 here.

That's a joke tag added by a reader, not the artist. (You can tell which ones the artist added by an asterisk next to them, though you may have to be logged in to see that.)

TIL what the star next to a tag means

Abyss Watcher wasn't too difficult. Far as Dark Souls bosses go you can fight the Abyss Watcher the same way you fight a UGS-wielding npc invader.

Mincemaker said:

Abyss Watcher wasn't too difficult. Far as Dark Souls bosses go you can fight the Abyss Watcher the same way you fight a UGS-wielding npc invader.

I was so happy I happened to have been carrying a buckler at the time.

Abyss watchers are very cool bunch.

Though, as for the boss fight, I find it quite easy. It only took me 3 tries.
First death on phase two, second death because I was a moron.
Third try was a tag team effort with the sunless.

All in all, very memorable boss fight accompanied with some of the best score from the series. Recorded the fight just so that I could extract the music (and sound) so that I can listen to it whenever I want.