Abyssal lords/beasts only count as 1 for kill counter : r/runescape
Abyssal Demons Slayer Task Guide | OSRS Tips and Tricks
2 Room Abby demon bursting example - YouTube
Boosted up slayer to try and get a whip and I landed an Abyssal Dagger at 54 kc from normal abyssal demons (technically 49 kc, was bursting them) : r/ironscape