Brennalfar Amber in Tribes of Midgard is a material used in a total of ten unique recipes, it's a solid idea to grab a handful of this material as you may need a nice chunk of it.
Brennalfar Amber Tribes of Midgard: How to Find It
To collect some Brennalfar Amber for yourself and for your tribemates if you are playing multiplayer is to seek out the Smokey Highlands (the desert biome) for Brennalfar warriors and archers.
Brennalfar warriors and archers will drop the Brennalfar Amber you seek on death. Materials like Midnight Yew Essence or Mushroom Oil are crucial recipes, (especially the Mushroom Oil) but the Brennalfar Amber gives way more options for recipes than those two materials.
With a load of Brennalfar Amber in your possession, you can now craft the fire elemental bow Embers Bow, as well as Gullveig's Blade and Gullveig's Skeggöx for a fire blade and fire axe respectively. The last of the four weapons available for crafting with Brennalfar Amber is the fire hammer Múspelheim Maul.
Six pieces of armor can also be crafted, all part of the Gullveig set. Boots, gloves, shield, chestpiece, helmet, and pants can all be made from a bit Brennalfar Amber, Oiled Leather, Obsidian, and Garnet.