As suggested by
this thread Elemental Susceptibility hasn't actually done anything since last October at least. I have no idea how this is supposed to be acceptable, especially considering the numerous mentions in the forums and possible bug reports.
And while we're at it I suggest that this morph of Weakness to Elements gets a
major buff, since no sane person would take it over the mana wonder that is its counterpart Elemental Drain.
Ideas:
1. Elemental Susceptibility is only removed once a target dies.
2. Elemental Susceptibility becomes an AoE ability.
3. Elemental Susceptibility's Major Breach debuff is improved every time the target is attacked and the duration is increased by a few seconds.