If you're just wanting which activities are currently going on, Platform/Destiny/Advisors/?definitions=true then check Response.definitions.activities[Response.data.nightfallActivityHash].skulls the skulls array has objects like this: { "description": "Arc Damage from any source is greatly increased." "displayName": "Arc Burn" "icon": "<iconURL>" } Though, if you're speaking about historical activities a player has done, Platform/Destiny/Stats/ActivityHistory/[membershipType]/[accountId]/[characterId]/?lc=en&fmt=true&lcin=true&mode=16&count=20&page=0&definitions=true this will show the last 20 Nightfall Strikes a character has played (though in testing currently mode=16 returns Nightfalls and Weekly Heroics both with "mode": 17 for some reason... anyways... once you get that data back: var nightfallHash = Response.data.activities[0].activityDetails.referenceId; Response.definitions.activities[nightfallHash].skulls .skulls will get you the array of modifiers on that event in the same format as the /Advisors skulls objects