Double nuts!
"Toughen" is Vine Magic. You can buy potions of Toughen in the Wizards' Guild, actually, but I don't know how many they have for sale...
Option...create you a Priest, and get him/her up to level 4 Vine spells...that's where Toughen is. Add him/her to your party back in Valeia. Have him/her charge the characters up with "Toughen" and run in and out of Valeia to get their HP up. Then take them back to Ishad N'ha. You can leave the Priest in Valeia if you don't want him/her along, or you can bring him/her with your others...it helps having Spirit and Vine magic!
If you only have 2 characters, Rumphy will probably yield about 3400 XP per character every time you kill him. See the other post to find out where Rumphy is.
-Saz
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