Answer:
Useful tool for who in darkness dwell. Within you, corrupting like a deadly spell.
Left to right Iām quite bright. Right to left I might bite.
A tree with 5 branches, no leaves and no fruits
I can travel from there to here by disappearing, and here to there by reappearing.
I can run but not walk. Wherever I go, thought follows close behind.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.