After finishing Novac's combat tutorial quest #2, he will give you another quest. He needs more specific animals for another potion.
These animals can spawn in one of many spawn points on both continents (at least one of them is portals rooms).
The listed "known possible spawn locations" are places where the creature has been found, but there probably are more possible places than are listed here.
Locations underlined are places where this creature does NOT occur naturally (at least to my knowledge).
Killing works the same way as in Novac #1 and #2.
Brownie
Known possible spawn locations: Grubani Peninsula, Morcraven Marsh, Tarsengaard
Wood Sprite
Known possible spawn locations: Glacmor, Sedicolis, Tahraji Desert, Tarsengaard (Roanof Island), Nordcarn
Boar
Known possible spawn locations: Arius, Palon Vertas, Tarsengaard
Brown Snake
Known possible spawn locations: Naralik, Zirakinbar, Hurquin
Rat
Known possible spawn locations: Emerald Valley Trade Route, Naralik Magic School
After you have killef everything, you will receive a reward of 100,000 Attack and Defense experience.