Index point blocker.
Her Strangle Dome is the perfect size to block the enemy's goal without overlapping and glitching the enemies on the walls in Index. They can't score, you can't lose! Good for endurance index to get the John Prodman's poster or as good support. Just place 1 strangle dome at the enemy's bank0 then reapply every 50 seconds. Use Ensnare to bring all the enemies together and Spectrorage (from Helminth-[Gara]) to force them to drop more energy and you can whip away.
For farming, check my Farmora: the same amount of formal but a few mod swaps.