To join the an adventure in The Sunless Realms you need only a few things.
A character to play.
At least two other players to join your adventure.
A specific quest or goal you wish to accomplish for the week.
Selecting a date that works with all accompanying players.
Confirming the adventure and date with the DM.
CHARACTER CREATION RULES
Characters Begin at level three (with the exception of elves), with a level cap of 9
Only use race options from the Dungeons And Dragons 5th Edition Players Handbook, excluding Half-elf, Drow subrace and Dragonborn. Custom lineage or background not allowed.
Stats generated by rolling 4d6 dropping the lowest die for each stat.
For non-paladin characters, you may swap final scores to any ability stat you'd like.
Gaining health when leveling beyond 1st level are rolled and rerolling the first "1" on the die. (example being you roll for health and the die lands on a 1 you may reroll this, however if it lands on a 1 again you must accept the new roll)
You may have only three characters within The Sunless Realms game at a given time and may not gain more unless your character dies or retires.
All races except elf cannot be Cleric (Domain of Nature), Druid, Paladin (Oath of Ancients) or Ranger
All elves must be Cleric (Domain of Nature), Druid, Paladin (Oath of Ancients) or Ranger
New Rules
Chaos Magic
Arcane Magic within the sunless realms is chaotic, strange, and often feared. At all times magic music be limited and restrained to be performed even remotely safely though there are always risks. Though there are times where potential rewards or desperation in a situation calls for cutting loose the restraints and tapping into the power of Chaos Magic.
An arcane caster may at any time choose to cast a spell with chaos magic, doing so expends no spell slots and turns the damage of a spell to Chaos damage. Chaos damage has the following properties.
Chaos Damage
The damage type becomes whatever the target is most weakest to. Otherwise it becomes fire damage. (Example: The wizard casts magic missile as chaos magic on a creature vulnerable to bludgeoning damage, the spells goes from 1d4+1 force damage to 1d4+1 bludgeoning damage)
Additionally the damage is rolled with advantage, meaning you roll the damage twice and pick the larger of the two outcomes.
This power comes at a cost of corruption and potential magical collateral damage.
Any spell casts as a chaos spell you must roll a 1d100, on a 5% or lower you trigger a magical mishap. Each time you cast a chaotic spell, this chance increases by 5% per spell slot level. This increase lowers by 5% at the end of a long rest.
Additionally, gaining 100% corruption will cause your character to become fully corrupted by chaos. Anything is possible at this state from exploding to transforming into a Monster.
Rest Rules
Short rest remain the same as is standard in 5e. Long rest are broken into two different types, Long rests and Extended Long rests.
Long Rests
Requires 8 hours.
You recover hit points at the end of a long rest equal to the maximum value of one of your Hit Die. This does not count as using a Hit Die.
You can spend one or more Hit Dice to recover hit points.
You can spend one or more Hit Dice to lower your Chaos Corruption by 5% per spent Hit Dice.
Your Chaos Corruption is lowered by 5% (Example when starting a long rest you have 50% corruption, at the end of the long rest you have 45%)
Extended Long rest
You take an Extended long rest when you are in an area of safety such as a town, city or stronghold for 24 hours. As a rule of thumb, if you need to keep watch you cannot take an extended long rest.
You regain all of your hit points.
You recover all of your Hit Dice.
Your Chaos Corruption is reduced to 5%.
Additional Playable Races
Within the world of The Sunless Realms, four human based nations act as major players within the conflict of the realm. If you chose to be from one of these nations you must use their racial features and stats.
While other humans who are not from these counties and nations exist, if you play as the Dungeons And Dragons 5e Player's Handbook Human or Variant Human you cannot be from these nations.
Alnadrian - Natural survivalist and friend to the Elves of Grendina, Alnadrians stand stalwart against the dark forces of The Eternal Court.
Balt-Varji - Their nation and their people are best described as lightning barely contained in a glass bottle.
Iraithelean - People of Iraithel, highly zealous faithfuls of Empyerus.
Rhadrian - Rhadrians are natual leaders and diplomats forming friends and allies with ease.
Restricted Classes and Races
For lore reasons certain classes and races have a number of creation restrictions, including but not limited to.
Paladins
Paladins within The Sunless Realms are chosen by the gods and are rare to come across, while some characters may seek out to become one, it is ultimately up to the design of the gods to grant this blessing. To reflect this to create a paladin you must adhere to the following rules during creation:
Announce to the DM that your next set of stats will be an attempt to get a paladin.
Roll stats in order using 4d6 and dropping the lowest, no swapping final stats.
If the your charisma stat is 15 or higher including racial bonuses than the character is allowed to use the Paladin Class.
You may have only one paladin at a time.
Elves
Elves of The Sunless Realms are unique race which has made a desperate agreement with Mervah, Spirit of Nature to extend their, now mortal, lives so that one day they may regain their lost immortality from the Eternal Court and as such became bonded with the wilds physically and spiritually, this came with the agreed cost of being unable to reproduce. Elves within The Sunless Realms have a finite number in existence and the potential to become extinct. To best reflect this "In limbo" aspect of the elves, when creating an elf you must adhere to the following rules during creation:
You are restricted to four classes, Cleric Domain of Nature, Druid (Any circle), Paladin (Oath of Ancients, additionally must adhere to paladin creation rules), Ranger (Any Archetype).
You start play at level 7 and can no longer gain levels until you regain your immortality.