Go out of Gridania using White Wolf Gate. Take first right. Take first left, there is a cave down there with Shrews. Glowflies, bats and Errant Spirits also pop there so you may or may not see Shrews your first visit. Kill and they will pop.
If that cave is occupied, go into clearing ahead and take first right. Another similar cave there.
Wada: "There may be some areas of testing that were lacking or too rigid."