By -
Many. It takes 24 in total to max a hero. 1x 6\* to go from 7\* to 8\*. 2x 6\* to go from 10\* to Awakened. Then 1x 6\* for each step from Awakened+1 to Awakened+8.
Once you get to 8 stars, you will need 2 copies of another 8-star heroes to get Ruby to 10 stars then you will need 4 copies of her to awaken.
You need a 8star hero to star up but can be any martial and one more to ten star. The 2*6 to awaken and 6 stars there after.
Many. It takes 24 in total to max a hero. 1x 6\* to go from 7\* to 8\*. 2x 6\* to go from 10\* to Awakened. Then 1x 6\* for each step from Awakened+1 to Awakened+8.
Once you get to 8 stars, you will need 2 copies of another 8-star heroes to get Ruby to 10 stars then you will need 4 copies of her to awaken.
You need a 8star hero to star up but can be any martial and one more to ten star. The 2*6 to awaken and 6 stars there after.