Plurality. Tales are rarely forged alone. Each player may invoke plurality once per session. You can invoke plurality when an ally attempts a d20 roll. Describe how your character acts to aid that ally, and the ally can roll with advantage or reroll.
Flashback. Once per level, prior to making a d20 roll, narrate how your character has faced or prepared for a similar challenge in the past. After your description, instead of rolling a d20, you receive the effects of a natural 20.
Manifest Equipment. Manifest equipment is a special type of magic item that grows with your character. See Eclipse (Manifest Sample) for an example.
Feature Stressing. Your features—namely spells and spellcasting—do what they are intended to do. You can stress your features by attempting an appropriate check, potentially pushing the bounds of its intended use.
Exploration
Clocks. Certain objectives are measured in clocks, and these objectives can range from short-term obstacles to long-term goals. When a clock is created, the DM tells you how many segments the clock has. By completing or failing objectives, a segment is filled in. When all segments are filled in, rewards or consequences ensue.
Combat
Potion Consumption. Potions can be consumed with an Action or Bonus Action. Potions can only be fed to another creature as an Action.
Recall Knowledge. You can leverage your skills and background to learn information. As an Action or Bonus Action, you can make a skill check to learn useful information about environment around you. Once per initiative, you may use a Free Action for this check. The difficulty class is based on the type of action and skill you use.
Summoned creatures. Creatures summoned by other creatures share an initiative count. The player controlling these creatures decides the order these creatures take their turns, but a creature must finish its actions before another creature of that initiative count can begin taking actions.
Occupying mounted space. Mounted combatants must choose one of three configurations when determining occupied space while on their mount. This affects how the rider is considered when measuring distance and AOE effects.
Literal. The rider is considered exactly where their token is.
Centralized. The rider is considered at the center of their mount. In the case of an even-sized mount, the rider is in the four tiles at the intersection of the mount’s center.
Blob. The rider is considered in all of the mount’s space.