There are a number of watchwords in Baldur’s Gate 3, with Lux Splenda being one of them, along with a secret chest. You will find its hint in the Undelivered Letter quest within Grymforge as you extract the Sharran Inquisitor Skeleton through the Double Iron Door.
Players will be able to find Lux Splenda Chest also, in BG3, which is, otherwise, toi. It is one of the letters within the game and a potential watchword. The following guide will help players find Lux Splenda’s location in BG3.
Quick Answer: The Lux Splenda Chest is located in the Reithwin Tollhouse area of the Shadow-Cursed Lands in Baldur’s Gate 3.
You must pass a Sleight of Hand lockpicking check to open it, or use the Knock spell as an alternative method to unlock it instantly.
| Requirement | Details |
|---|---|
| Skill Check | Sleight of Hand lockpicking check (DC varies by difficulty; typically around 14–18). Requires Thieves’ Tools. |
| Alternative Method | Cast Knock spell to unlock instantly, or break the chest with force damage (may destroy fragile contents). |
| Rewards | Gold, consumables, and random loot depending on progression and difficulty. |
Where To Find The Lux Splenda Chest And Letter in BG3
You will get its name scribbled in the Undelivered Letter as part of the Lore Items in BG3. The letter is covered with dust and marks and dirt with players within the Grymforge location of the game.
The Undelivered Letter has a value of 14 and a weight of 0.5. There are a number of Lore items, the likes of letters, books, and journals. They help in starting Quests and helping you progress in the game.
Some Lore items will also give you abilities and improve your Inventory in BG3.
You will have to carry the skill of Investigation to examine the Undelivered Letter. You will gain intelligence through this, which reflects your ability score and level of proficiency.
Once you have extracted the items from Grymforge, ensure you are going through all the skeletons to find the Lore item. There are different prizes to be gotten, with Guns, Weapons, and coins on offer in the bones.
Finally, players have to cast a light spell on the Wooden Chest to unlock the letter and start investigating.
Lux Splenda Chest Location
For players struggling to locate the letter of Lux Splenda, you have to head to the Area of the Lever and use the Carousel Device within Grymforge.
Activate a Long Rest at the camp and go with the Iron Ladder to look for the Double Iron Doors. Move to the Sharran Inquisitor near the rows of books within the Iron door.
Go through the skeleton of the Sharran Inquisitor and extract the Undelivered Letter. You must inspect it through the Investigation prompt to find Lux Splenda.
Once you have found the Lux Spenda Letter, within the Undelivered Letter, there is a Dancing light skill which is actually called Lux Splenda, used to open this chest. This will help to keep moving in the event.
There is also the Harper Key that opens the Lux Spenda Chest. This can be taken through the skeleton, along with other rewards. There is also the option of doing other quests in Grymforge after this.
Thus, that is all the information players will need when deciphering the Lux Splenda Letter in Baldur’s Gate 3. All you have to do is find the Undelivered Letter, which can seem tricky in the beginning, but as you search around Grymforge, your task will be made easier.
How to Increase Hit Chance in BG3
To increase hit chance in Baldur’s Gate 3:
- Raise the ability tied to your attack (Strength for melee, Dexterity for ranged, Spellcasting ability for spells).
- Gain Advantage (high ground, invisibility, guiding bolt, etc.).
- Use proficiency-based weapons your character is trained in.
- Apply buffs like Bless.
- Reduce enemy Armor Class (AC) with debuffs or conditions (e.g., Prone, Faerie Fire).
High ground and Advantage are the fastest ways to boost hit chance early game.
How Accuracy Works in Baldur’s Gate 3
Accuracy in Baldur’s Gate 3 is determined by a d20 dice roll:
Attack Roll = 1d20 + Ability Modifier + Proficiency Bonus (if applicable)
If your total equals or exceeds the enemy’s Armor Class (AC), the attack hits.
- Rolling a 20 = automatic critical hit.
- Rolling a 1 = automatic miss.
- Advantage rolls two d20s and takes the higher result.
- Disadvantage rolls two d20s and takes the lower.
Your hit chance shown in-game is simply the calculated probability of beating the enemy’s AC based on these modifiers.
FAQs
Q: How To Navigate To The Chest?
A: Go near the dwarf that wants you to investigate the ruins and go down. Here you will see mimics and at the bottom. Cast your Illumination Spell and that should work for you
Q: What is the “Undelivered Letter”?
A: The Undelivered Letter is a lore item in BG3. These items can be consumed for effects like buffs or healing, while others interact with the environment or provide world lore.
Q: How to use the “Undelivered Letter”?
A: Each character can attempt an Investigation check on the letter until one succeeds, revealing that casting Light on the chest will make it visible.
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Last Updated on February 19, 2026
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