Charm & Horadric Seal Trading Guide
Charm trading
Charms are traded as Rare charms, Unique charms, Set charms, and Mythic charms. Magic grade charms are not traded. Unique charms are the most frequently traded grade, so the onlytems listing screen defaults to Unique charm and the shared class automatically, leading straight into option search and entry as soon as you arrive.
Charms have a power axis (Standard and Ancestral) separate from grade. When listing, specify both grade and power. For Unique charms, enter class, body, unique power, and random options; for Set charms, enter class, set bundle, and selected tiers. To pass listing validation you must fill 2 lines of regular options (set bundles and Mythic charms are exceptions — see below).
Mythic charms (Hellfire Torch) come with fixed options, so you do not pick options. Enter the value of each option and whether it is a Greater Affix, then choose the set on the "+1 Set count" line that each item rolls at random. Sets differ by class, so a class is required when listing; in search, leaving the class at "All" shows listings for every class. Greater Affixes exist only on Ancestral items, so turning one on sets the power to Ancestral.
Horadric Seal trading
Horadric seals are traded at the Legendary and Unique grades. Magic and Rare grade seals are excluded. Entering the listing or search screen selects Legendary by default; to trade a unique seal, choose Unique as the grade.
Legendary seals have a different option pool for each class. So class is an important condition in both listing and searching, and it is more accurate to set the class first and then apply option conditions. Listing validation requires 3 option lines (1 regular line plus a 2-line set-linked pair, or 3 regular lines).
Unique seals come with fixed options, so you do not pick options — choose the unique seal from the list and enter only the value of each option. Every class can use them, so no class is selected either. In search, an option whose value is left blank is not used as a condition.