| PossibleCabbage |
2bz2p is correct. The archetype effectively grants you "the land around you" as an implement and forces you to choose it as well as its two focus powers at specified levels.
It's a good archetype, for anybody looking for a martially inclined "Guardian of Nature" character it stacks with Panoply Savant so you can take Trappings of the Warrior and have your full BAB nature magic warrior.