JMS Expansion

There are special scrolls for it that add something like 2 to all stats with a fairly high success rate.

Actually all of the scrolls are quite risky. The only good one has a super low success rate.

Dark Scroll for Helmet for INT/DEX/LUK/STR (icons are actually... not dark):
+3 to INT/DEX/LUK/STR at a 70% success rate. If it fails, the item will be destroyed at a 50% rate. Only works on the ヴェイカントサークレット when slots are available.

"Miracle Scroll" (WorldLingo translation):
+4 to STR/DEX/INT/LUK, +4 to accuracy/avoid, +14 to defense/magic defense, +40 to HP/MP at a 5% success rate. Only works on the ヴェイカントサークレット when slots are available.