Many times you may face a team using some type of e-denial. Switching to a negative energy offhand and negative energy weapon will force your energy closer to 0, thus causing the mesmer to drain you to 0 faster. This also makes the mesmers skills weaker since many of the skills depend on the amount of energy you currenty have. This way, if you want to cast something, just switch to ur main set, cast, then switch back. It would also be nice against a team running wither/malaise.
I have 2 of these but i May keep one.
