My group is mostly balanced, they just don't have those particular spells. The arcane and divine casters are a sorceress and oracle who just don't have Raise Dead or Teleport.
But they do both have Fireball (flame oracle), and the sorceress has the metamagic feat to convert it to acid, which gives her an extra point per die of damage from her draconic bloodline. So troll regeneration won't be a problem.
Their bigger concern while a man down is whether they have enough tanks to keep the bad guys off the casters. They're used to having a cavalier and paladin both tanking in full plate and high HP, but now the cavalier is dead. They do have a ranger, but he's archery focused, and the ranger's badger companion is three levels behind what a druid's companion would be, so it's probably not quite tough enough to tank at this level without getting killed. Besides, they really haven't invested heavily in armor for the badger, since they figured they didn't need it up front very often before now.