Odinforce

The Odinforce is a powerful magic used by the Kings of Asgard, most notably Odin, hence the name. It is also the source of power of the Destroyer and Gungnir, and must be periodically replenished by entering the Odinsleep.

War Against the Dark Elves
Five thousand years ago, the then-king Bor led the armies of Asgard in their struggle against the Dark Elves into their Homeworld of Svartalfheim to secure the Aether, a weapon of infinite destruction. Arriving on the Dark World, Bor fired blasts of Odinforce from his spear Gungnir to cut down swaths of Dark Elves.

Thor's Banishment
During Thor's coronation, a squad of Frost Giants infiltrated Odin's Vault. Sensing their presence, Odin activated the Destroyer, which was stored within the Vault itself. The Destroyer armor powered up, summoning the Odinforce and disintegrating the intruders with energy blasts emitted from its head.

After Loki angrily yelled at his adoptive father for not informing him of his true nature, Odin collapsed in shock. Immediately after, Loki called upon some guards that carried him to the bed chamber where he is supposed to stay until his Odinsleep is over, during which Odin would rejuvenate and replenish the Odinforce.

Non Canon Use
"Brave Sif, soon Thor will need you, and so too will all of Asgard. Today I deny fate..."

- Odin

After the death of Sif at the hands of a Frost Goliath, Loki visited Odin who informed him that he would use the Odinforce to revive Sif. Loki told him that Thor would defy him and wage war against the Jotuns until Ragnarök. Odin stated that his intention in reviving Sif was to prevent Thor from starting another war with the Frost Giants. Loki expressed belief that this plan would work and that Thor would defend Asgard in Odin's stead while he recovered in the Odinsleep. Odin used the Odinforce to revive Sif, but stated that she would not wake for several days. Drained of an immense amount of power, Odin entered the Odinsleep.