Saving throws and refreshing takes place at the end of your turn. You may make 1 saving throw and 1 refresh roll each turn.
Saving Throws are used to remove conditions or fight death (see: Death). To make a saving throw, roll 1a20. If your roll is >10, you succeed. If not, you fail.
Saving throw modifiers: Hunger and Rest.
Hunger has 6 levels: Bloated: -1, Well fed: +2, Fed: +0, Hungry: +0, Very Hungry: -2, Starving: -5. Bloated lasts 12 hours and then skips to fed. Well fed lasts 12 hours and then drops to fed. Fed lasts 24 hours. Hungry lasts 12 hours, very hungry lasts 12 hours, starving lasts until you eat or die
Rest has 5 levels: well rested: +2, rested: +0, tired: +0, Very tired: -2, exhausted: -5
Well rested lasts 12 hours, rested lasts 12 hours, tired lasts 12 hours, very tired lasts 6 hours, exhausted lasts 6 hours, and then you pass out.
Refreshing refreshes abilities you have used. Your basic attack never needs refreshing (unless you have a sniper rifle). To refresh, roll 1d6. If the number is equal to or greater than the required number, your ability is refreshed.
Special note: if your roll is 4 higher than needed, you may refresh again. (I.e. if you need a 1, a 5 or 6 will let you roll twice. You may never refresh more than 2 abilities is one turn