You can solo with Archon, but Archon itself doesn't offer anything to get or keep stuff off of you if you start feeling uncomfortable with your HP. Your other soul choices need to be able to provide that option as a solution. Pet souls (Necromancer, Elementalist) are a possible solution, but you'd have to pick them as a main soul if you do that so that the pets don't become...outdated. If you don't like pets, Dominator is a possible option, but you'd want to drop 16 points in Dominator to Quicken Form (Instant Transmogrify). Pillaging Stone is pretty much going to be your main offensive spell all the way to 50.