I Can Transform into Thousands of Monsters

"Monster Brand Illustrated Book" - Kill a monster and its soul will be condensed into a brand. Those who activate the brand can shed their mortal bodies and transform into thousands of monsters, taking advantage of their talents and powers. You can also fuse and sublimate the brands to create a stronger one! "Alas, transforming into a sea monster and overturning a battleship, transforming into a dragon and flying to the top of the clouds... It's really still too far away." The young man closed the illustrated book in his hand and sighed. His eyes fell on the dimmest brand that had just been lit. Then he cheered up and clenched his fist. "Forget it, the tall buildings will rise from the ground! It's not a bad idea to start with Goblins to adapt to the version." "Besides, even in Goblin form, I'm definitely the most handsome one." He raised a bright smile with a hint of green at the corner of his mouth, and while cracking his knuckles, he slowly turned his head and looked at the trembling green-skinned beast standing among the goblin corpses not far away: "You're right, man?" (Multiple heroines, a hodgepodge of fantasy elements, pseudo-DND, slow-paced adventure)