Tinkering around with guardian burning builds and I discoverd a nasty combo of symbols and permeating wrath. For aoe I can get permanent burning with symbols up with +0 condition duration.
Must tinker more....
FYI I'm making an RP build with human helm of truth. The burning truth, to find and present the truth and discover lies. Using hammer mace/torch. Hammer of truth, mace of sincerity and torch of cleansing :P
So far it has perma protection for melee so good deal.