Power Sword

Sometimes also referred to as the Sword of Power and the Sword of Grayskull. It started out as a mystical object, in which Skeletor tries to obtain both halves and put them together in order to gain control over Castle Greyskull, while He-Man's role is to stop him by using more regular weapons such as an axe and a shield.

the origins of the Power Sword is also related to Castle Grayskull. The castle is revealed to be the former home of an ancient warrior king named King Grayskull, who resembles He-Man but larger and with longer Viking-like hair and a massive green saber-tooth lion as a steed. The Power Sword is King Grayskull's personal weapon, and after fighting a fatal battle with Hordak, the dying king binds his mystical powers to the weapon. Afterwards his advisers become the Elders who seal the castle, and his wife becomes its guardian, the first Sorceress. Therefore, when Prince Adam holds up the sword and calls out "by the power of Grayskull" he is calling on the energies of King Grayskull himself, rather than those of the namesake castle.

The Sword of Protection
The Sword of Protection is the similar twin weapon as the power sword as is wielded by Adora. Prince Adam's twin sister, and is used in her transformation into the heroic She-Ra. Instead of the war-cry, "By the Power of Grayskull," Adora's transformation is triggered by calling "For the Honor of Grayskull." Similar in overall design to the Sword of Power, the Sword of Protection is, however, more slender, having a finer blade reflecting its female owner, and has a jewel imbedded in the hilt. The jewel is the key to such powers of the Sword of Protection as Adora's transformation; if it is damaged, she loses her ability to transform into She-Ra, as seen in the episode "The Stone in the Sword." In addition to being a formidable weapon capable of cutting through most substances or deflecting attacks, the Sword of Protection has the ability to change its shape, a trait not shared by the Sword of Power. She-Ra can change the sword to a variety of weapons or tools through spoken command, varying from a shield or lasso, to a helmet or flaming blade.