Powerful Blockade is an imbuement that can be applied to items of type Shields, Spellbooks, Helmets. When applied, it raises shielding skill by 4.
Astral Sources
When imbuing an item with Powerful Blockade, the following items are expended:
20× Piece of Scarab Shell, 25× Brimstone Shell, 25× Frazzle Skin
Notes
The ability to apply this imbuement can be obtained by defeating the Melting Frozen Horror during the Forgotten Knowledge Quest.