Maces improve hero physical attack and magic defense. They are complex items, so sometimes, their crafting may be confusing. Here is a guide that may help clarify the matter.
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To craft an Apostle's Mace, you need one Siren's Song and two Giant-Slayers.
Note
Each of these items consists of 20 fragments that you get in Campaign missions. Thus, you need 40 Giant-Slayer fragments to craft two Giant-Slayer items.
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To craft an Angel's Mace, you need an Angel's Mace Recipe and two Apostle's Maces (i.e., two Siren's Songs and four Giant-Slayers).
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To craft an Archangel's Mace, you need an Archangel's Mace Recipe and two Angel's Maces (i.e., four Apostle's Maces or, in other words, four Siren's Songs and eight Giant-Slayers):
Note
Several heroes need these items for upgrading. Be careful when equipping an item and double-check if you are upgrading the desired hero.