2SBD Quick give away...

2sbd give away

Try to guess what the answer to this poem is, if you can get it right, you get 2sbd... sharp..

I expect every participants to know the answer, the first five correct answer will get a different reward before I declare the answer.

Rules to participate
Upvote
Resteem
Reply your answer in the comment.

This contest is just to have fun.
I love Fridays....

Poetry question

Tiny ghouls
Devouring mankind
Like invisible mercenaries

Re killing the dead
Chewing them like gums
Surrounding their graves

They are monsters
Just like an hobbit
But they have their special weapon

Attacking mankind
They don't seem to fear
A very disturbing devil

Whistling before attacking
Piercing into skins
Killing you softly
And you don't seem to notice

An army of fighters
Surviving by mankind
Attacking with vengeance
Just to make ends meet

They've got wings to fly
Can go into any depth
Can suck things up without growing big

What are they???

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Thanks to @genesisproject for their support.