Yeah and slot for end drain/dmg. It fires off basically the equivalent of ten charged bolts, but also adds -recovery (Ten charged bolts = 400 dmg unslotted and -50% end unslotted, though it's over a decent amount of time). Considering you can spawn it out of combat, it's pretty good in my opinion. Granted, I've never played an elec/therm, so I'm just basing this off the numbers and way it works. Ive never actually used it before.
for an elec/therm... would ya take voltic sentinal?
50 fire/dev--50 dark/thug--50 earth/storm--50 fire/regen--50 earth/thorn--50 kin/rad
50 TA/archery--50 stone/mace--50 Rad/em--50 Cold/Energy--48 dark/elec--50 grav/rad--45 SOA--40 PB--46 Bs/Fire--50 Ar/Dev--50 Trapz/Dark--50 elec/em tank--50 elec/earth--50 Ghostwidow--50 elec/Therm--50 cold/dark