Raptor Rope Necklaces are found on the Velicoraptor, in the Lost Valley. This armor is very good neckware for all classes, although some warrior types prefer to enchew the hp gain for the added damage roll give by wearing Square Scarfs. Raptor Rope Necklaces are typically level 90 - 94, but can be as low as level 87.
This is what identify reveals about this item:
Object 'raptor rope necklace' is type armor, extra flags dark evil magic anti-good.
Weight is 4, value is 200000, level is 92.
Armor class is 17.
Worn:Takeable Neck
Affects mana by 166.
Affects hp by 166.
Affects hit roll by 7.
Affects damage roll by 6.
Affects detect evil by 18.
Affects disarm by 2.