The tactic of using a defensive tank to absorb attacks is an interesting game mechanic. Obviously you don't want all encounters to be simply a single warrior holding all aggro while everyone else unloads on the mob, but anything less is seen as a failure by the MT and a cause of group wipeouts.
It would be nice if there were some indications from the mob that they were considering breaking aggro and going to pound on some squishy caster, so the MT could try and taunt to get it's attention and any other tanks could get ready to react. You could have suspense build and frantic adjustments to what the group was doing without actually having the mob turn and rip the enchanter's lungs out.
Something as simple as "[creature's name] howls in anger at [character]" (or glares at, or hisses at, whatever) giving you a clue that after a short delay period they're going to switch targets. Said character can then either lay off the nukes, fire off a divine barrier, evade, jolt or whatever while the MT tries to taunt the attention back.
It would be nice if there were some indications from the mob that they were considering breaking aggro and going to pound on some squishy caster, so the MT could try and taunt to get it's attention and any other tanks could get ready to react. You could have suspense build and frantic adjustments to what the group was doing without actually having the mob turn and rip the enchanter's lungs out.
Something as simple as "[creature's name] howls in anger at [character]" (or glares at, or hisses at, whatever) giving you a clue that after a short delay period they're going to switch targets. Said character can then either lay off the nukes, fire off a divine barrier, evade, jolt or whatever while the MT tries to taunt the attention back.