Yggdrasil - Norse Themed Metal Dice SetRunes of Power. With a 4000 foot wide trunk and enormous branches that extend all the way up to heaven, this great ash tree creates its own plane of existence. Also known as the world tree or the tree of life, the Yggdrasil connects the prime material plane to the astral and outer planes. A climb to the astral planes, though not impossible, takes about 100 days, that combined with erratic gravity throughout this giant tree, is a task no mortal has