People seem to assume that Soothsayers have unlimited mana in boss fights. The undead spider boss took me about 15 rounds to defeat as a soothsayer the first time and I barely got by. Remember that it's the first boss in the game, and concentration (mana regen skill) is deep in the magic tree and takes a lot of magic runes to max out. Unless you are really lucky and find the rage to mana conversion spell before that, but that still uses up a turn of the book to use.
Soothsayers have a smaller army, and their stats aren't tailored around attack/defense. So I'd disagree with the fact that mages have an easier time with boss fights. Much later in the game however, when mana isn't an issue that balance may shift. But I doubt Skalds and Vikings have much of an issue either with the ridiculous damage they can produce with their much bigger army and higher attack/defense stats, which makes it much easier to dispatch all the summons that bosses throw at you better than a mage can until the spell Geysers at rank 3 comes into play.
Both the Skald and Viking aren't excluded from using magic either in boss fights. It's never "useless" to buff your whole army to deal max damage, or give them extra speed or teleport for example. Mages excel at dealing damage, but the utility spells like Bless and Berserker are still very powerful for non-mages to use.
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