A very cool moment as Ragnar, still very much a sickly man (that part wasn't a trick), pumped up his intensity for one final act. And that shot of Bjorn throwing up his arms, sending the vikings in to plunder the streets, was awesome.
Answer Wiki. Incubus is a mythical creature, a demon in male form who preys upon sleeping women in order to father children. According to Malleus Malleficarum, demons are infertile and unable to procreate (due to the fact of them being dead) so they came up with a proxy way of making people.
Ezekiel describes creatures with four faces: the face of a lion, of an ox, of a man and of an eagle, and later identifies them as cherubim (Ezek. 1:10, 10:14, 20-22). The first three of those forms correspond to the Lion, the Bull, and the Water Bearer constellations. The fourth apparently corresponds to the Eagle, the constellation which is often substituted for the serpent/scorpion when symbolizing the celestial aspect of the fourth cornerstone.