Seems like a good question. 6 "a daydream" spawn. I cleared them out 6 times so far. No named. EDIT: Cleared them 9 times now. I have also been killing a roaming "an enchanted mare" . Spawned Daelai twice so far. On the 10th set of "a daydream" the Wisp of Hope spawned. It dropped the Mace of Dark Dreams. Doing it for the hunter achievement though not the loot if it matters.
Also drops , Arms and legs remnants ....At first we thought the Ph was the roaming Daydream that paths almost into safe camp near the entrance to the waterways, at a guess this one gets cleared more often as we can confirm the Ph can be any 'Daydream'