Golden Sun Chalice should be semi-fragile as it breaks after healing.
The Earthen Scorchstone actually blocks a full 5 dark icons.
^I can confirm that with absolute certainty.
The IDB entry for the Ylanas Blaster shows that (amongst others) it does 5 fire icons, but in the exact icons section it shows that it only does 4. Is this a mistake or is the fire damage over represented? ie, is this a 11.63 (fractional earth too) weapon or a 12.63 icon weapon?
Scary Dark Potion is only a single use, and it's cousin Potion of Purest Red is also a single use that does nothing.