It's the end of the world as we know it(and I feel repentant)

Centuries past the tide has risen
Til the time one last soul is given  
Hateful current from abyss spills forth  
Intently travelling on its earthbound course  
Now rising from their graves instead  
That which walks but once was dead  
Within the fiends lies just one thought  
To seek the living til all are sought  
The sounds provide a gruesome rhythm  
As skin and flesh and bone is riven  
Upon the hour that silence dawns  
No single soul is left to mourn  
No joy nor sorrow  
No pain nor mirth  
What remains is hell on earth