2017 · ソースブック（プレイを拡張するルール／オプション）

Blade Barrier

This supplement provides optional rules for customising a blade barrier spell without using feats. Once the spell is known, it can be altered through cosmetic changes, beneficial effects, or penalties, with benefits increasing the spell-level cost and penalties reducing it. Options include changing the type of blades, causing creatures that pass through to bleed, or creating tiny gaps that allow smaller creatures to pass unharmed. Additional rules address balancing the system when customised spells become too powerful.