Runs away from players. They may attack if trapped.
Wisps spawn in secluded regions, and they seem to be afraid of players. They drop the extremely rare Moon Backpack. Note that you won't lose stamina if hunting them in order to get their loot.
2 on the way to banuta following the river, 2 west of Hardek, here. One south west of Thais cyclops camp. Several groups of wisps can be found in and around the forests north of Edron: (2 here, 3+ around here, 3 around here and 2 around here). 2 north of the triple wyvern spawn outside Kazordoon, here. One west of Ab'Dendriel, here. One west of Venore amazon camp. here.
A few spawns around Venore: (here, here, 2 here and 2 around here).
Just follow and attack them and try to corner them because they run.