I think its a downtuned E to a D, but I'm not sure. If it sounds better to you, play a 6-8 instead of 8-10 in the second part and then open E. G|----7-7p5-------------------------------| D|----------7-----------------------------|X4 A|-5----------8-10-8-10-8-5---------------| D|----------------------------------------| G|----------------------------------------| D|--5-5p3-0-------------------------------|X2 A|----------------------------------------| D|----------8-10-8-10-8-0-----------------| G|----7-7p5-------------------------------| D|----------7-----------------------------|X2 A|-5----------8-10-8-10-8-5---------------| D|----------------------------------------| G|-----------------------------------7-5-3-------| D|-7-7-5-0-7-7-0-5-7-5-5-5-5-5-3-0---------5-3-0-| A|-----------------------------------------------| D|-----------------------------------------------|