Tribes had ELF gun which drained your Energy quickly (practically forcing you to fall flat on ground), some people found it useful while others didn't.
Little offtopic: I really wouldn't mind removing the auto-regen altogether, or limiting it to certain radius from homebase. Currently maps like Nivosus & Moonshine suffer from idiotic base design which favors chaser/flag returner far too much if carrier gets cornered in 1vs1 (let alone in 2 def vs 3 O situations), as if that wasn't bad enough there's also universal ammo stations... meaning attacker can replenish both ammo AND health while carrier placed in hopeless situation.
ELF was ugly. What I'd like to see is an MJ1284-submachine gun which fires automated rockets that hit your target 225% of the time. That's what I call a weapon
