2. The Conclave of Artisans (Seasonal NPC Hub)
Once a party clears a high-tier group dungeon, this NPC unlocks new recipes:

Shared Enchantments: Add a bonus stat that activates only in parties (e.g., "+5% party XP gain," "+10% group critical hit chance").

Sigil Fusion: Combine two Nightmare Sigils to Diablo 4 Items create a hybrid dungeon that pulls from both types (e.g., Helltide + Vault).

Crafting Recipes That Encourage Team Building
The materials gathered from group content could be used for crafting recipes that reward specific team synergies. These recipes might include:

Aspect of the Twin Fury:
"When you and another Barbarian both use Ultimate Skills within 3 seconds, reset both cooldowns."

Helm of Shared Resolve:
"Reduces crowd control duration by 10% per party member within 20 meters."

Crafted Sigils of Convergence:
Dungeon keys that scale monster abilities based on party roles (i.e., stronger elites for ranged-heavy teams, more AoEs for melee-focused parties).

These types of recipes would encourage players to cheap Diablo IV Items think not just about how they play, but who they play with.