Any Items picked up while Adv+ is active will be shared with allies. However Allies will only recieve a 50% divided by number of allies on the battlefield.
example:
Item | X2 | x3 | x4 |
100 HP | 50 HP | 33 HP | 25 HP |
x2 - 30 Seconds | 15 Seconds | 10 Seconds | 5 Seconds |
Weapons that have this Advanced +