1. Rotting Spores
Description: A material possibly linked to POE2 Currency Ervig's fungal powers, these spores could be used to craft chaos-based gear or poison-enhancing items. You may be able to use Rotting Spores to re-roll affixes or add poison damage over time to your equipment.

Use:
Upgrade items with poison or chaos damage.
Enhance the chaos resistance of gear or armor.
Add damage over time modifiers to weapons or accessories.
2. Fungal Essence
Description: A rare crafting material dropped from Ervig, this essence could be tied directly to his control over the fungal ecosystem. Fungal Essence would be ideal for crafting items that either enhance poison-based abilities or provide resistance against chaos damage.

Use:
Add chaos damage to weapons or increase damage over time.
Craft poison resistance gear or augment resistances.
Use in alchemy-based crafting to enhance gear with damage over time or poison-specific stats.
3. Miasmic Sap
Description: As Ervig controls the environment with fungal and chaotic forces, Miasmic Sap could be a byproduct of his nature, used for crafting items that deal chaos damage or have poison-related properties.

Use:
Poison Damage Boost: Add significant boosts to poison damage over time or chaos resistance.
Craft chaos-themed weapons or items, such as wands, bows, or daggers with specific damage over time bonuses.
Damage Amplification: Increase chaos damage modifiers on items that boost area of effect (AoE) poison damage.
4. Toxic Spores
Description: A crafting material related to poison effects. This item could be used for enhancing or modifying gear that supports poison and POE2 Currency for sale chaos damage.