Sometimes it’s necessary to keep things moving in a game or prevent one player from stealing the spotlight from others. To help with this we have a number of meta rules which are assumed to be in force unless the DM specifically allows an exemption.
Spell Tweaks 
- For One-shots (like Escape) Wish spell is one-time use per player
- Unless previously agreed with the DM Wish can only be used to:
- Duplicate a spell of 8th level or lower (with a casting time of 10 mins or less)
- Fully heal all living party members
- Resurrect all dead party members (to 1hp)
- Non-damaging Cantrips can be cast as a bonus action
- Pass Without Trace gives advantage on stealth checks (or +5, not +10)
Healing Buffs
- Healing potions always do maximum healing
Fair Gameplay 
- Racial traits (like Magic Resistance, Breath Weapon or Lucky) can only be used once per long rest (PB/2) but some ranges are increased – see Racial Tweaks for more detail.
- Flying creatures must make a constitution saving throw to stay airborne when damaged (similar to spell concentration)
- Limits to token numbers for certain game-types may be imposed to keep player turns quick.