Answer:
they get all of their energy from dead materials
Step-by-step explanation:
The most likely reason for this is that like most other species of fungi, they get all of their energy from dead materials. Fungi are classified as decomposers, meaning that they break down dead material such as their dead hosts in this scenario with special enzymes that they produce. The fungi then feed off of the decomposed matter in order to extract the necessary energy that they need to survive. This is most likely why they are able to kill their host and still thrive.