Fire giants
Tzhaar
Ogres (combat training camp) or near Yanille
Rock crabs (waterbirth island)
Slayer tasks
Blue dragons for good xp and money (taverly dungeon)
Black demons (taverly dungeon)
Caged ogres?
Lesser demons outside the tzhaar place
spiders in the stronghold
Hill giants (sort of crouded)
Waterbirth rock crabs (takes a little bit to find a spot but if you find one it's good xp)