Just thought this might be interesting and haven't seen it for awhile.
So the discussion is, what is your PERSONAL favorite solo spot for Exp and why? What about that spot, your toon/level, gear, or mobs makes it a "favorite" of yours? NOTE: you do not only have to pick "the best" in everyone's opinion! Maybe you like a spot cause it's low aggro and low stress! That's cool too!
I'll start (and argue this is solo because a servitor comes from the main toon only).
Frozen Lab. Warsmith. Level 53-58 with Golem summoned (at 58 don't need the golem!).
Lost Golem Quads!!! (3 lost golem led by a frozen golem).
With hotbar set up conveniently (next targ/attack/servitor attack) I can kill the quad in about 9 seconds. At 57 the quads are still white to me and the experience with Vit 4 is about 18,000 per mob.
The golems are blunt weak. Interesting to some perhaps--I use an Aoba rather than a polearm. Aoba is augmented with minor crit and patk and +3 with Health SA (I've had it a long time).
One of my favorites? Frozen Lab golem quads with mid-50's Warsmith!