lord of the under

the nighttime breeze whistled through the tree branches, creating a serene setting for the dead, the old owl hooting and the fireflies buzzing.
"ugh I'm gonna be late for my sister's bamiftsa again" a young man said as he swept the fallen autumn leaves from the grounds of the graveyard.
"crtch"
"what was that" said the young man as he looked around wearily hoping he was just hearing things
"crtch" the sound came again, louder this time. The young man's eyes darted around until finally resting on a gravestone to his left, three gravestones away. he took cautious steps getting closer and closer towards the garvestone till there was only 3cm separating him from gravestone. upon taking a closer look the young man could see the words " here rests the great Under not in peace but in darkness till he risses and comes again " written on the tombstone.
The young man felt a shiver up his spine as he read the carvings on the stone.
" I think I'm done for the night" stated the young man as he took hastened steps away from the grave of the under and turned towards the exit of the grave yard , The young man stopped in his tracks as he saw a black outline of a man just a few feet ahead , next to the gate of the entrance to the graveyard.
" Hello? um sir you can't be here. We're closed"The young man carefully took slow steps backwards as he slowly reached to his pocket for his phone to call the police, but before he could, A hand grabbed his arm ,said arm's grip force was so strong the young man fell to his knees while desperately trying to free his right arm using his left hand.It was to no avail. The grip was too tight,it wouldn't budge.
"let go Aargh! bastard your hurting me!!" shouted the young man as his attempts to free himself got more desperate and forcefull.
The young man turned his head towards the direction of his captive and was struck mute as he went livid , he saw the had coming straight out of the ground of the grave of the under . As the hand held him rooted to the spot , the rest of the body slowly made its way to the surface as dirt broke apart to let the person through .
A decrepit skeletal figure emerged