This is a quote from my favourite help thread regarding grimoire Need Strikes? [spoiler]Nightfall, Weeklies, and playlists don't count towards your strike completions. The only strikes that count are the original strikes on the planets. If you go into a strike by yourself, it will only count as one. However, I completed them with one person in my fire team, and it counted as THREE every time! Find a buddy and get them done![/spoiler]