Use:
Craft or augment items that provide poison duration or POE2 Currency damage amplification.
Modify amplifier gear to increase damage over time effects.
Add chaos damage to weapons or accessories to improve weapon effects.
Fungus-infused Leather
Description: Dropped from fungal-themed bosses or zones, this material could be a type of crafting material for armor that grants chaos resistance or poison resistance. It could also be used to imprint specific chaos-boosting properties onto armor.

Use:
Armor Crafting: Use Fungus-infused Leather to increase chaos resistance on armor.
Poison Resistance: Craft armor or accessories with poison immunity or enhanced damage mitigation against poison-based attacks.
Improved Survivability: Enhance overall survivability through armor upgrades and resistance boosts.
Putrid Spores
Description: A rare material with potential use for upgrading chaos and poison weapons or armor. Putrid Spores could be used for creating debuffs or improving damage output in poison-based builds.

Use:
Weapon Crafting: Enhance bows, daggers, or wands to deal poison-based attacks or increase chaos damage over time.
Unique Modifiers: Add special chaos-based or poison-based affixes to items, improving the effectiveness of damage over time in your build.
Toxic Fungal Root
Description: This root could be tied to the grasping roots of the fungal flora found throughout the Grim Tangle and the influence of Ervig. It could be used for crafting chaos damage or damage over time gear.

Use:
Item Modification: Use the Toxic Fungal Root to alter weapon stats or upgrade existing gear with more chaos damage, poison duration, or damage over time abilities.
Unique Enchantments: Craft gear with improved poison damage or increased AoE poison that can stack and apply debuffs to enemies.
Corrupt Essence
Description: This item could be linked to chaos damage and the corrupting influence Ervig has over the land. Corrupt Essence could be a high-tier crafting material used to significantly boost chaos or damage over time effects on specific gear slots.

Use:
Chaos Damage Amplification: Add or enhance chaos damage over time on items or weapons.
Poison Affixes: Enhance gear to provide higher poison damage effects, improving overall build efficiency.
Crafting Stations and Vendors
Fungal Anvil: Potential crafting station that could use materials like Rotting Spores or Fungal Essence to improve or craft items focused on chaos or poison themes.
Chaos Workbench: Could allow you to imbue items with chaos damage or re-roll items for more chaos-related affixes.
Poison Specialist Vendor: A vendor who trades materials like Miasmic Sap for gear that boosts poison resistance or cheap POE 2 Currency enhances chaos damage.