Weapon Compare Rates

Weapon                       Stab    Slash Crush Attack rate
Guthan's warspear 75       75         75         Slow
Sara Sword 0         82         60         Standard
Zamorakian spear         85       65         65         Standard
Abyssal whip                0          82         0           Standard
Dragon Claws               41        57        -4           Standard

Sara Sword is good exp for Slash +82 for Attack, Strength, and Defense.

Tied with it is Abyssal Whip for Slash for Attack and Defense.

Best for stab at +85 for Defense is the Zamorakian Spear.

Blood Runes

At level 77 runecrafting you can make Blood runes if you've completed "The Legacy of Seergaze."
The Blood rift is next to the cosmic rift  in the Abyss.