One credit was awarded for every percentage of the spear charged when damaging Tuska during the event (up to 100 per day), as well as for each Tuska fragment collected. Additionally, handing in a completed daily challenge rewarded the player with 25 credits. Astromancer credits expired on 20 July 2015 - attempting to interact with any remaining credits will cause them to vanish. They were discontinued from the Grand Exchange on 3 August 2015, with the price at 2,163 coins from its initial listing at 10,000 coins.