Currently number 1 on hc waves ladder at wave 706, level 91. Still alive. The video has gameplay from waves 500 to 510.
This video showcases my Hardcore Crit Sorcerer build focusing on the Armageddon node on the Blackhole tree and comboing that with Mana Tunnel (the “next cast is free” node) on the teleport tree. This bypasses the huge mana cost of Armageddon. For supplemental damage I use glacier with the 80% reduced mana cost node because this build does not use mana strike or focus. Haven’t had any mana issues though. Meteor is also an option but I felt glacier was probably a better choice for mana control.
Enjoy:) Feel free to ask questions in this thread.