Unless there are unique circumstances, campaigns run in the world of Kyor rely on these house rules.

The text of the Counterspell spell should be changed to this:

You attempt to interrupt a creature in the process of casting a spell that takes an action to cast. Make a contested check against the original spellcaster using the spell attack bonus (Spellcasting Ability modifier + Proficiency Bonus) plus the spell level of the original spell or counter spell. If the counterspeller's check is higher the creature’s spell fails, and they lose the spell slot for the failed spell. If a creature's spell is counterspelled, they may only use their action to cast a cantrip instead. Spells that take a bonus action or reaction may not be counterspelled.

This campaign uses a twist on the flanking variant rules.

When making a melee attack, you get a +2 bonus to hit if your opponent is threatened by a character or creature friendly to you on the opponent’s opposite border or opposite corner.

When in doubt about whether two friendly characters flank an opponent in the middle, trace an imaginary line between the two friendly characters’ centers. If the line passes through opposite borders of the opponent’s space (including corners of those borders), then the opponent is flanked.

Exception: If a flanker takes up more than 1 square, it gets the flanking bonus if any square it occupies counts for flanking.

Only a creature or character that threatens the defender can help an attacker get a flanking bonus.

Creatures with a reach of 0 feet can’t flank an opponent.

Consuming a healing potion can be done as a bonus action. Other potions and administering a healing potion to others takes an action. Healing potions consumed as an active action always heal the drinker for the maximum amount possible.

Be warned, player characters die in D&D games. Players of dead characters are welcome to help play monsters or NPCs for the remainder of the session. At their first opportunity, the player may create a new player character of the level of all the other still living player characters. This new player character may choose to take as much non-magical equipment they can physically carry. In these cases, we'll probably have a cut scene introducing the new player character to explain their arrival.