Those syringes full of magical juice, both the normal and super varieties, can stimulate your body from battered bones and shredded flesh back to Isaiah Mustafa -like condition in the blink of an eye, meaning that your health bar is basically infinite until you've exhausted your supply. In normal mode, you're basically invulnerable until you run out of stimpacks. This is the biggie - all the rest of the changes combined won't affect you as much as one. More like 'HELL Yes!' 1: Stimpacks don't heal instantly What's Hardcore mode, and are you hardcore enough to play it? Don't jump in blind: read our guide to the five big differences, and tips for how to survive the increased deadliness of the Hardcore Nevada wastes.