Sure! Here’s an organized and detailed guide to help you locate all hidden collectibles and upgrade materials in Death’s Door.

Collectibles: Shiny Things
In Death’s Door, there are a total of 24 collectibles known as Shiny Things. Collecting all of them will allow you to unlock a door to a bonus boss fight in the post-game. Below are detailed descriptions and locations for each collectible mentioned in your query:

1. Makeshift Soul Key
– Location: Grove of Spirits.

2. Undying Blossom
– Location: Lost Cemetery.

3. Incense
– Location: Lost Cemetery.

4. Old Compass
– Location: In the Lost Cemetery region, enter the door of the building just south of the Reaper’s door. Burn the spider web blocking the path, then proceed through the opened gate after lighting the lantern.

5. Sludge-Filled Urn
– Location: Estate of the Urn Witch.

6. Old Engagement Ring
– Location: Ceramic Manor. Access the ballroom, climb the ladder unlocked after defeating enemies, and follow the wooden boards to the back of the room.

7. Old Photograph
– Location: Ceramic Manor.

8. Rusty Garden Trowel
– Location: Estate of the Urn Witch.

9. Magic Forest Horn
– Location: Overgrown Ruins.

10. Malformed Seed
– Location: Overgrown Ruins.

11. Corrupted Antler
– Location: Mushroom Dungeon.

12. Giant Arrowhead
– Location: Throne of the Frog King.

13. Grunt’s Old Mask
– Location: The Stranded Sailor.

14. Ink-covered Teddy
– Location: The Stranded Sailor.

15. Token of Death
– Location: In the cave system between Lost Cemetery and The Stranded Sailor. After crossing a wooden bridge, descend the ladder, then use an anchor point across the waterfall to access the top of a wooden coffin.

Upgrade Materials
While specific upgrade materials weren’t detailed, here are some key pointers for upgrading your character:

– Souls: Primary upgrade materials earned by defeating enemies. Collect these while exploring to boost your abilities.
– Other Items: Various items can be absorbed or collected that may contribute to upgrades.

General Tips for Collecting
1. Thorough Exploration: Always ensure you’ve checked every accessible area in each location; hidden paths may lead to collectibles.
2. Utilize Your Abilities: Make use of your abilities (like fire spells or grappling hooks) to reach otherwise inaccessible areas.
3. Focus on the Red Aura: After finishing the main story, areas with remaining secrets exhibit a red aura around the doors; this will help identify locations where you’ve missed collectibles.

Additional Resource Recommendations
For a comprehensive guide that includes all 24 Shiny Things, consider watching video tutorials available online, such as those on YouTube. These can provide visual gameplay tips and strategies to make your search easier.

Following this guide will enhance your chances of uncovering all collectibles and upgrading efficiently in Death’s Door! Happy hunting!