From now through September, RuneScape and Old School RuneScape players who are also Twitch Prime members will be able to score four packages of in-game goodies that are collectively worth $55. Items include one-month membership, two Umbral Chests, the Umbral Waraxe, Umbral Wingset and Umbral Salawa Akh as well as 200 RuneCoins, 15 Treasure Hunter Keys and 40 Hearts of Ice.
RuneScape and Twitch have collaborated in the past, releasing two sets of rewards that provide free cosmetics to those who have a Prime subscription on Twitch. The cosmetics from these previous packs remain available to those who haven’t claimed them previously.
RuneScape Currency can be used to purchase cosmetic items. Treasure Hunter Keys can be used to unlock daily chests to "win prizes". Hearts of Ice "are used to freeze categories to avoid unwanted prizes".
If you're a RuneScape or Old School RuneScape player, head to your Twitch Prime page to collect your first package of goodies.