I was at the stable where you get the double axe; I believe Woodland, but it may have been one further South. I chopped down about 5-7 trees that were spaced out around the stable and rode to them on my horse. It was morning. The stable is on the corner of a road and has a cliff face very close behind it, with an open field in front and another cliff face visible on the opposite side. The trees I chopped were to the left of the stable when facing the entrance, and three in the middle of the field across the road.
Then I remembered the woods outside of
were very plentiful, and fast traveled there. I started at the logs outside of the stable by the stumps, and then chopped down some of the closest standing trees. I worked forward on the trees to the right of the trail when facing the stable about 4-5 trees deep towards the South. I did not bare the woods at this point. I went back towards the stable and grabbed another axe, and while there I chopped up the logs under the two overhangs on the side and back of the stable.
I chopped the trees in the immediate vicinity to the southeast of the stable, up until the first octorok. I think I got turned around at this point, because the trees closest to the stable regenerate when they're outside of the screen. At some point the trees began to develop portals when they fell. It couldn't have been too long because I used a used double axe and then when it broke a woodcutters. The portals spawned when the tree had finished the motion dropping to the ground, and always appeared wrapped around the center of the log. The portal would stay for 60 seconds and then disappear. I tried to center the log in the middle, crouch through it, shoot it with an arrow or hit it with a weapon, throw an apple through, and eventually took a photo to see if the Compendium could tell me anything. The Compendium did not give any indication it recognized anything being there.
I chopped down, I would estimate, another 12-15 trees. Then the smoke occurred; the animation would start as a black "cloud" coming out from under the log and then dissipating into three wisps at either end of the log and in the center.
This continues until I fast traveled from the area.