Personally I'd like to see Warden's Paeon reduced to a shorter cast time ... say one second, or half a second. Three seconds for a single target requires clairvoyance (or knowing the fight going in), and isn't of much use for on-the-fly DoT prevention. Alternatively I'd be happy if they kept the three second cast time, but made it a group-wide song. Maybe even extend the duration to, say, five minutes. Reapply as necessary, but it'll last long enough where you don't have to keep a sharp eye on it.