Enchantment to Strengthen Mortal Weapons

This enchantment was cast by Merlin on Lancelot's spear. The spell he chanted was: "Bregdan anweald gafeluc!" He used it to allow Lancelot to kill the Griffin, a creature of magic that couldn't be killed by any mortal weapon (Lancelot). Merlin used again this spell ("Fléoge! Bregdan anwiele gefeluc!") to make Arthur's sword fly and to kill the Questing Beast (Le Morte d'Arthur).

Merlin learnt this spell in Gaius's grimoire and, when he first tried it, it took him several tries to make it work, for it was the most powerful spell he had cast so far. When he tried it again against the Questing Beast he managed to cast it at the first try, demonstrating that his powers had grown.