Ascension materials can definitely be a grind to obtain, but there are ways to increase your chances of getting them:
- Fill your monster/hero chest as often as you can. You can use a few gems to skip the wait time between chests if you have extra energy to burn. The more chests you fill, the more loot rolls you get and the more likely a rare elemental chest will appear.
- Hit every titan at least once so that you can get a share of the loot.
- Get as far as you can through every rare quest that appears. Stage 4 always has a guaranteed 3* material, and Stage 5 always has a guaranteed 4* material.
- Try to complete at least the Epic tier of each monthly challenge event. The completion bonus for that tier has at least one 3* material.
- Do Mystic Vision every time it appears. It’s rare, but you can get materials from that as well.
Good luck!