My first tab, most likely some mistakes.
Drop C Tuning (CGCFAD)
(/) Slide Up (h) Hammer On (b) Bend (v) Vibrato
D|--------------------------------------|-----------------------------|
A|--11b13--11b13--11b13--11b13--9-------|-------9---------------------|
F|---------------------------------10v--|--6/8-----10--8--------------|
C|--------------------------------------|-----------------10--8-------|
G|--------------------------------------|------------------------11v--|
C|--------------------------------------|-----------------------------|
D|------------------------------11--10--8-------------------------|
A|--11b13--11b13--11b13--11b13-------------11--10--8--10--10b11v--|
F|----------------------------------------------------------------|
C|----------------------------------------------------------------|
G|----------------------------------------------------------------|
C|----------------------------------------------------------------|
[ Tab from: http://www.guitaretab.com/m/my-darkest-days/320656.html ]
D|-------------------------------------------------------|
A|--11--9--11--9------9-11--9-11--11b13131313--9h11------|
F|----------------10--------------------------------10v--|
C|-------------------------------------------------------|
G|-------------------------------------------------------|
C|-------------------------------------------------------|
D|--------------------------------------------6h8h9----------8h9h11---------|
A|------------------------------3h4h6--6h8h9---------8h9h11----------8h9h11-|
F|-----------------------3h4h6----------------------------------------------|
C|----------------5h6h8-----------------------------------------------------|
G|---------5h6h8------------------------------------------------------------|
C|--4h5h7-------------------------------------------------------------------|
D|--13--15--16--18v--|
A|-------------------|
F|-------------------|
C|-------------------|
G|-------------------|
C|-------------------|