To quote Lord Recluse:
Well, you'd have to try pretty hard to accidentally get an Item of Power.
1. Build a base
2. Build the Supergroup Mission Computer
3. Build a Raid Teleporter
4. Build a Vault in that base (which can only hold Items of Power).
5. Place 6 Dimensional Anchors in your base (needed for the Item of Power)
6. Take the Item of Power trial from the mission computer.
7. Get together the large (larger than 8 ) team for the trial.
8. Successfully complete the trial.
There, you've accidentally gotten an Item of Power!
IOP when in your SG base gives your whole SG a bonus. I have no clue what that bonus would be. My guess would be most likely something along the lines of one of the accolades - +5% end, +5%hp etc.. (I stress it's a *guess*)
Note the trial is for SG members *only*. So we need more than 8 active members in the SG to complete the trial.
Note, this is exhibit 'B' for how important SGs will be.