To create a Mystic Branch, follow this step-by-step guide:

1. Have an upgraded altar with at least 3000 power available (use a Skull and Chalice to increase power)
2. Have a kettle built
3. Create Mystic Unguent in the kettle
4. Chop down Rowan, Hawthorn and Alder trees until an Ent comes. Kill it to get an Ent Twig
   
5. Draw a heart glyph with Golden Chalk
6. Around the heart glyph draw a small circle with Ritual Chalk
   
7. Around the heart glyph draw a medium circle with Ritual Chalk
8. Drop the Ent Twig and Mystic Unguent in the middle circle, check there is still 3000 power in the altar
9. Wait until night time
   
10. Activate the heart glyph and wait for the Mystic Branch to appear