Hardest 'League of Legends' Patch 12.9 Challenges System Missions—Most of Them Need Five-Man Team
You may need a five-man team for these missions. Aside from being a great strategy title, "League of Legends" is also known for its quests. Long-time players already know that they also need to complete the missions of Riot Games so they can receive lots of rewards.
Source: gamenguide.com