If you are a new player check ikora ray she will have a quest the unlocks the solar subclass Or check the quest kiosk you will find it in the left corner next to the postmaster To unlock the cryo ( aka stasis ) you must complete the beyond light campaign To unlock stasis full potential you need to the born in darkness quest this will reward you with the grenades and aspects And there are fragments, you get them from a weekly bounty from the exo stranger You will have three different bounties One for crucible One for strikes And one for gambit Choose the one that fits your play style However you can only get 2 fragments each week ( there are 6 in total ) You cannot use fragments without aspects If you need more help dm me or reply in here