our Udumbara:

instance 1 : spawned by kill leshy.
instance 2 : spawned by kill Diakka.
instance 3 : i killed 50 leshy,Diakka,Mossling and Sapria. NO Spawn.

i still belive spawn condation same Minhocao. Leshy and Diakka they have same drop "Beech log".

anyone have new information?