Game Mechanics

XP & LVL
You need experience to level up. You receive experience by defeating enemies.

The formula for XP changes depending on if you leveled up in a server or joined one due to a bug.

Formulas to be added later. The formula changes when you rejoin a server to scale to your level, but at level 1, it takes 50 XP to level up and increases by 25 each level. Every 5th level the XP is 4x that of the previous level.

Your HP scales with your level, and having a higher level allows you to unlock more talents and equip more items.

Level 5 unlocks the Stat Passive, Talent 1, and Passive 1 of each class. Level 15 unlocks Talent 2. Level 25 unlocks Talent 3. Level 35 unlocks Talent 4 and Passive 2.

In downstairs Side Slash, the level cap is 305. In upstairs Side Slash, the level cap is 25.

HP
HP is your health. HP scales with levels, from a base of 45 HP at level 1. HP increases by 5 each level up.

You are automatically healed upon level up.

If you run out of HP, you die. Dying in a dungeon will respawn you, but in a boss room you will become a spectator. When all players are spectators, you are sent back to the house or basement.

Auras can increase or decrease your HP. Death Oxygen is the only aura which decreases HP.

Both Crypt and Malware's stat passives change HP. Crypt increases it by 50%, while Malware decreases it by 25%. In previous versions, the decrease was either 15% or not at all.

Some of Crypt's talents cost health and some recover health.

Materia
Players have 100 Materia. You gain 1 Materia per second, and gain 1 more per second while attacking enemies with the basic attack. Materia is used to cast most talents, and the cost can be reduced with Talent Cost auras

Inventory
The inventory is accessed with the 'I' key, or clicking on the bag

The inventory has 7 sections in total. Only 3 are accessible in downstairs Side Slash, being Auras, Weapons, and Misc. Upstairs Side Slash has Pets, Emotes, Skins, and Cubes

You can equip or use items from your inventory.

Your inventory also shows 2 currencies, Tix and Slash Coins Tix can be obtained from mobs, bosses, or Daily Rewards, while slash coins can only be obtained from daily rewards.

iFrames
All talents give iFrames (invulnerability frames) for different amounts of time. iFrames makes you invulnerable, so you cannot take damage. This is considered a necessary skill along with dodging to defeat bosses.

NOP
Bosses can become invulnerable depending on what they do or what stage of the boss fight they are in. While they are supposed to be unhittable, certain actions such as Demiglace's hail or Specter's passive rifts can bypass NOP.

Stagger
Both Players and enemies can be staggered when hit. When a Boss is "staggered" or "down" they enter their damage phase, allowing them to be hit without resistance. Bosses need to be damaged a certain percentage of their health to enter DP, or they need to use certain skills.

Critical Hits
All weapons have a base critical hit chance of 10%, and a base critical damage of 200%. This means every hit has a 10% chance to do 200% of it's original damage, or 2x.

The Malware class stat passive increases critical damage by 50%, to a total of 250%. Specter's Passive 2 rift has a 20% crit chance.

Prior to the great data reset, lunacy weapons had a chance of 15%.

Drops
You need 10% damage contribution on normal boss, or 5% damage contribution on a raid boss. Some bosses may have their contribution amounts altered. Regular bosses role for drops 3 times, while insanity and raid bosses roll 6 times. Regular boss material is supposed to be guaranteed, while other drops are random.

Base drop rates are 75% for uncommon, 50% for rare, 15% for legendary, or 5% for mythical. These can be altered depending on the boss or item.

Aura Bonuses
There are currently 6 aura bonuses. Damage increases all damage. Talent Cost reduces the cost of Talents. Even Boost increases the damage of even numbered talents (Talents 2 and 4). Odd Boost increases the damage of odd numbered talents (Talents 1 and 3). Equal Boost increases the damage of all talents, but not basic attacks or passives.

Data Loss
Sometimes saves don't reach the ROBLOX servers before you change locations. This will mean your drops might not save after a dungeon. If you quickly change locations (such as going from Basement hub to the House) you can load the missing save data before it gets overwritten by new save data.

Changed Items
Sometimes boss drops are changed after release, which can lead to items of the same name having different bonuses. It can even lead to items having the wrong class. If an item is equipped while it is deleted from the game, your data can become permanently corrupt.

Talent Breaking
While rapidly resetting or using the BunBun Whistle, your talents can lock up or break. This can happen normally as well, but is very rare.

Lag Switching
Lag Switching can lead to a variety of bugs which will not be listed.

Minor Bugs
There are several minor bugs and visual glitches, like a previously selected item's set being shown if you select an item that is not a part of a set. If your data loads slowly, your icons can show as blank x99s. Your Inventory will keep items past the inventory limit, but they will never stack. During the summer event, there was a bug which would give hundreds of stacks of low amounts of summer gems. While this is patched, it quickly filled up beyond people's inventories and they would have to spend hours deleting them.