Would you like an in-game parser?

[Eastwall]

How else does a DNC know who to partner if they can't see the damage numbers...? .

aggro. You can see people's aggro position in party list. The number is kinda small so it is hard to notice.Obviously aggro 1 and 2 will be tanks. Assuming no one dies, the dps with highest aggro is doing Most damage. That's how l play cards as ast