The Nether Tree's roots all focussed on one point as each root's endpoint had a grey flame burning on it. The black flames of the tree burned darker, devouring all the light in the surroundings and the cave became pitch black with only small grey flames that were visible in the darkness.
The roots that pierced at the empty spot at the same time, and they also didn't extend to the cave walls. A small hole was suspended in the air, the roots struck the hole again and again, slowly opening it and the grey flames melted the edges of the hole and the hole grew larger and larger.
Crackle! Crackle! Crackle! Crackle!
BOOM! BOOM! BOOM! BOOM!
Lightning bolts struck down from above until the cave ceiling collapsed then the lightning bolts bombarded the Nether Tree.
[It's already too late. I'm not going anywhere and the portal to the Nether Realm will be opened today!] said the Nether Tree and endured the lightning bolts and continued to open the portal to the other side.
[OPEN!!!]