Runs away from players. They may attack if trapped.
Wisps spawn in secluded regions, they seem to be afraid of players.
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.