To enchant weapons in The Elder Scrolls IV: Oblivion , you can use two main methods: Sigil Stones or Soul Gems at an Altar of Enchanting.

Enchanting with Sigil Stones

• Sigil Stones are obtained by completing Oblivion Gates during the main questline.
• Each Sigil Stone has a preset magical effect that can be applied to one weapon or one piece of armor.
• You simply select the weapon you want to enchant and apply the Sigil Stone’s effect, then name the enchanted item

Enchanting with Soul Gems at an Altar of Enchanting

• Find an Altar of Enchanting, such as those in Frostcrag Spire or the Arcane University (after joining the Mages Guild).
• You need a weapon that is not already enchanted, a filled Soul Gem (the bigger the soul, the stronger the enchantment), and knowledge of the spell effect you want to enchant.
• The process involves:
  1. Selecting the weapon to enchant.
  2. Choosing a filled Soul Gem as the power source.
  3. Selecting one or more magical effects to add to the weapon.
  4. Adjusting parameters like magnitude and duration for the effects.
  5. Naming the enchanted weapon.
  6. Paying the gold cost and confirming the enchantment.
• Enchantments on weapons consume charges when the weapon hits a target, and the number of charges depends on the Soul Gem used

Additional Tips

• Sigil Stones provide unique effects not available through Soul Gems and can sometimes be more powerful.
• Altars allow multiple effects on weapons, while Sigil Stones only allow one effect per weapon.
• Use Soul Trap spells to fill Soul Gems by trapping souls of creatures before killing them

In summary, to enchant a weapon:

• Obtain a Sigil Stone from an Oblivion Gate or a filled Soul Gem.
• Go to an Altar of Enchanting or use the Sigil Stone directly.
• Select your weapon, choose the enchantment effect(s), set parameters, name your weapon, and finalize the enchantment