His shadow bolts are not affected by grounding totems, so they will do absolutely nothing. Stay bunched up. In heroic, I pull him to outside the doorway to LOS him and get him up close. I'm posting a video later today if you want to see for yourself. Just get close enough so that your consecration covers your slaves, that way they wont get skeleton aggro.

As for the tomb, its a matter of preference. I got the achievement (killing him without shattering any tombs) first time I did heroic and I didn't even try to - I just ignored the tombs and healed, so both versions can work fine. I think the key is to get him close and keep a close eye on the healing.