Necrotic works. Just might take a try or two to get a decent spawn on the other side. What you're looking for is scarabs; true, sometimes the Forgotten boss on the other side is close enough to the edge for you to use him, but that's kinda rare. Scarabs on the other hand are much more likely to be there.
So, get as close to the edge as you can, and move around a bit, to trigger any possible scarabs located there. Just kill them from the distance then, and use Necrotic. Move around some more, once on the other side, to trigger more scarabs; bring them to the edge again. Once they're dead, the rest of your team can use Necrotic to teleport to your side.
If there's members in your team without Necrotic, they'll need a vampiric weapon to kill themselves as close to the edge as they can, and you need either a N/Mo or Mo/N with necrotic+rebirth, to rebirth them over to the other side. Easiest if everyone has necrotic for themselves, tho.
This can be henched, to a certain extent. In the past I've done it as a necro, with two other necros (one mm, one SS, one blood), abandoning the henchies on the other side of the pit. Possibly doable even with less human players. Those guys who can solo Thirsty could prolly blast through this. (if they don't depend on any monk skills, that is). All you need to fight are a few scarabs, a couple of enchanted, and three bosses. Nothing remarkable. Breakfast of champions.