Shield Generator

The Shield Generator is a item in Risk of Rain that surrounds you by strong light and makes you invincible for 8 seconds.

Unlock
This item is unlocked by staying above 70% health for 25 minutes into the run, NOT for any 25 consecutive minutes.
 * Does not require being in combat or enemies to be alive.

Item Synergies
Having at least six stacks of allows  to cool down in less time than the effect itself lasts for, rendering the player permanently invulnerable through constant use.

Drones are also somewhat immune to damage.