
I propose that every class have access to the:
Signet of Invisibility
Signet. All nearby party members are made invisible to monsters for 30 seconds. Party members under the invisibility effect cannot be attacked by monsters, but they move at only 25% max speed. Monsters will return to their patrols if no visible party members remain. This skill ends prematurely if the player attacks (for that player only). [All skills are disabled while under the effect of invisibility]
Cast Time: 3 seconds (interrupted if the caster takes damage)
Recharge: 180 seconds
The beauty of this is that if somebody does run off and aggro a huge group, the rest of the party can huddle together and cast Invisibility. The runner will die, the monsters will return to their patrols and the game continues as normal. Abuse is significantly reduced due to the 3 second easily interrupted cast, meaning that it can't be used just before the party gets annhiliated. Running speed is very slow so it can't be used for runs (ie droknars forge run). Also, if anyone decides to attack while invisible, the spell ends for that person only, since everyone else is invisible, they will likely die.
Opinions?
[edit: added skills disabled]