Demogorgon can be a nice training experience too. In phase 1 while the rest of the party are closing portals, aggro Demogorgon and pull him to the side to keep him occupied. It helped me find a rhythm with different encounter powers and set ups. If it all goes horribly wrong then you can respawn and get back into combat…
I've found RA's knockback quite handy in certain circumstances... soloing in Batiri camp in chult for example. SW, Tr then biff the zergs back with RA. Rinse and repeat.