Cain turns on and prepares his interface for this dungeon, something he's never done before. The health and mana globes appear in the bottom corners of his vision, party member status down the left side, almost in his peripheral, Summon details hidden, and a spot for active buffs high and centered in his line of sight. That should let him know how Might of Many and the attack power bonus from his spear are doing.
The final part is to turn off titles and Guild tags and turn on detailed life bars. They hover over everyone's head and show health and mana levels. That should be enough to see at a glance that everyone is safe. Now save that as a preset so it comes up the same way every time he enters an instance, but returns to normal when he exits. No need to know if random people in the street are mildly injured or low on mana. But seeing their name, title and Guild tag is important sometimes.
