Pale Oak is a Rare Melee Weapon found in Baldur's Gate 3.
Where to Find Pale Oak
You can find the
Pale Oak weapon in Druid Grove. It can be obtained during the quest, Investigate Kagha. You must be a Druid when doing this mission. During the quest, you should spare Kagha's life. The Pale Oak will be a reward from Kagha but it will not be granted if you are not a Druid.
As a disclaimer, if you kill the Goblin Leaders prior to this quest, you can no longer participate in this quest.