Equip the Nexus slab and use it on enemies which are in a big group but spread out slightly. Get lucky or calculate which enemies are best.
Use Influence slab upgrade on Nexus so that it will automatically spread and link the enemies together for you over large distances.
Find a group of Eternalists on any map at any time. Make sure they're spread out but not too far away so the nexus network can establish itself. Shoot one on the edge.
To get the Influence upgrade keep killing the Visionary with Nexus slab to get the upgrades for it.