+100% eidolons

Starting around November 2017, +100% elemental attack eidolons will be released for each element over the course of ~9 months. While these are the strongest single upgrade you can seek for your team (~28% damage increase), the odds of rolling one for your primary element are low: ~1.2% per 10-roll under optimal conditions. In other words, your chances of landing the one you need are vanishingly small unless you’re doing dozens of rolls. Saving jewels for a few months for a shot at one could be beneficial, especially if the SSR kamihime it’s introduced with is strong, but don’t get your hopes up. These eidolons are essentially bait to give the high-rollers something to spend on.