There was no doubt that the five-element spirit heart was useful to Li Tian. When he was hit by the purple-gold awl from the seventh-stage Qi refining cultivator from the South Pill Hall, if he hadn't had a leaf from the wood spirit Tree in his body, he might have died there.
Furthermore, even though it was only a small leaf on the wood spirit Tree, Li Tian had yet to use it up completely. The injury caused by Dong Yi's punch was quickly recovering.
As for the fire spirit Tree, it had played a key role in Li Tian's breakthrough to the fourth level of the Qi refining stage. It could be said that the spirit blood was only a supplement. The real effect was the pure and violent fire spiritual force.