Had nothing better to do, so I figured I'd add a new bit to the barbarians, with ideas on how to flesh them out contributed by Hanslanda.
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As you walk away from the now quiet and more literally dead tower, several books and fine trinkets in your pack along with the steel slab you'd been sent to retrieve, you take a drink from that lovely platinum flask you took of the dwarven necromancer. Your thoughts drift along idley until the next day, where you see a great mountain range in the distance.
The air reeks of death, and bones line the land. You shrug it off, hiding from the grimelings and harpies as you climb the first mountain to find an alcove to sleep in for the night. Then you see it. As you reach the mouth of a cave, you see a silver slab. While your skill with barbarian is shakey at best, you can make out "Abandon all hope, ye fools who enter here." Below is a crude carving of a dwarven skull with crossed flails. You ignor it and make camp in the cave, and crack open the Barbarian book at a random page to kill time until you fall asleep.
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... It seems war has become a test of adulthood among the barbarians. Specifically, the "Trial of the Maw." It seems they have fought the Spawn fo Holistic for so long that these demons are ingrained into the culture of these corrupted humans. The trial consists of a warband captain leading a group of green warriors, regardless if they be male or female, to fight a group of Spawn. According to the clan historian I spoke to, casualties always run high in the Trail of The Maw, with 45% of a warband being killed or otherwise incapacitated/crippled on average. All those who come back alive must bring a trophy, wether it be an eye, an ear, finger or tooth, as proof they stood against the beasts. Those who cannot continue to be warriors due to injury fill the other roles of the clan. I've seen those individuals. She was a barbarian girl who was notably more human looking, though her skin was still a sickly ash color compared to the usual dark grey or black these people exhibit, had lost use of both legs in her trial due to motor nerve damage, but was among the better metalworkers in her settlement.
However even she' like all others in the settlement, had at least one trophy. Trohpies taken in battle are considered thier most trreasured possessions, and while they share other things relativly freely with thier own, to take thier war trophies is to incur the wrath of the whole settlement, even the warband marshal, who is the chief noble of these villages. The most commonly taken trophy is the tooth of an enemy, thought others may opt to take ears or fingers, the latter being second most common.
[Following is an image of a finger necklace, and an amulet composed of a tooth set in fired clay. I intend to draw this and edit it in later.]
The following appears to be of thier various gods and festivals, so you continue reading well into the night until you fall asleep at last.