Note: As of update .27 there have been changes to the Orb Prime and how it works.
The last hitter obtains the Orb Prime along with activating the holders prime card (as of update .27). The player can the do 3 things:
- Take the orb to the enemy drop off point in the opposite lane, close to the second tower. This activates the Prime Helix Card of each player for 150 seconds.
- Keep the orb and its buff to turn the tide of team fights.
- Take the orb to the ally drop off point to restore all of the ally inhibitors completely.
Note: Taking the orb to the ally drop off point will be adding in a nearby update but hasn't been implemented yet.
Note: As of update .27 the Prime Helix Guardian gives CXP globally to all players.