With 4.20 we introduced a new way to create stunning visual effects, Niagara. While Niagara is still in beta many of its amazing features are ready to try. Sit down with Wyeth from the team behind Niagara to get a glimpse of its awesome visual power!
https://dev.epicgames.com/community/learning/livestreams/7P8/an-introduction-to-niagara-feature-highlight-unreal-engine-livestream