Fortification

Fortification is an artifact type introduced in Future Sight. A Fortification can be attached to a land following the same rules as an Equipment attached to a creature. It uses the Fortify keyword, its counterpart to Equip. So far, the only Fortification in existence is Darksteel Garrison.

From the Comprehensive Rules (June 7, 2024—Modern Horizons 3)

• 301.6. Some artifacts have the subtype “Fortification.” A Fortification can be attached to a land. It can’t legally be attached to an object that isn’t a land. Fortification’s analog to the equip keyword ability is the fortify keyword ability. Rules 301.5a–f apply to Fortifications in relation to lands just as they apply to Equipment in relation to creatures, with one clarification relating to rule 301.5c: a Fortification that’s also a creature (not a land) can’t fortify a land. (See rule 702.67, “Fortify.”)

From the Comprehensive Rules (June 7, 2024—Modern Horizons 3)

• 604.4. Many Auras, Equipment, and Fortifications have static abilities that modify the object they’re attached to, but those abilities don’t target that object. If an Aura, Equipment, or Fortification is moved to a different object, the ability stops applying to the original object and starts modifying the new one.

From the Comprehensive Rules (June 7, 2024—Modern Horizons 3)

• 702.67. Fortify
  • 702.67a Fortify is an activated ability of Fortification cards. “Fortify [cost]” means “[Cost]: Attach this Fortification to target land you control. Activate only as a sorcery.”
  • 702.67b For more information about Fortifications, see rule 301, “Artifacts.”
  • 702.67c If a Fortification has multiple instances of fortify, any of its fortify abilities may be used.