Sanguine Martial Craft is a Restoration spell in The Elder Scrolls III: Morrowind that temporarily increases the value of the armorer skill. The skill returns to its original value when the spell ends. The magnitude is the value of the increase in the skill.
This spell is not available for purchase in Morrowind or expansion packs. Although not intended for use by the Nerevarine, it can be acquired on the PC by using the console:
Player -> AddSpell "dynamic martial craft"