Bloodveld are a level 76 NPC located in the Slayer Tower. You can access them VIA Training Teleport > Slayer Tower> Floor two. They are a common slayer task from Vannaka, and a fairly easy one if you use protect mele prayer.
Bones - 100% Chance.
Dragon Scimitar - 11.11% Chance.
Dragon Medium Helm - 11.11% Chance.
Blue Charm - 1.01% Chance.
Green Charm - 33.33% Chance.
Gold Charm - 9.09% Chance.
Crimson Charm - 4.16% Chance.
Note: Also drops lots of misc. Rune pieces.