The Village Artifacts mod makes villagers more useful. And it does so by adding many useful items and by adding various other improvements. Pillagers can be converted into Town Guards. And Iron Golems can be upgraded to make them stronger. The mod also adds some items that can be used on various mobs. Here's a list of them :

Rough Emerald Shard - Unlock trades when a villager has them blocked (red X). Also used as crafting material in many items.
Amulet - Convert pillagers into Town Guards to fight and defend against raids.
Oblivion Stone - Upgrade your Iron Golems. New versions are upgraded and will never attack players even when hit.
War Emblem - Summons Pillagers on use.
Ichor of Virtue - A bribe used to increase your reputation and erase crimes done in the village.
Plague Remedy - Heal zombified villagers without needing potions.
Trading Contract - Convert a Wandering Trader into a villager.
Infernal Shard - Corrupt villagers and traders into Pillagers, and can make some illagers even more powerful.
Scroll of Hubris - Use on a Villager and they will erase their profession, including all levels and trades, even if work-blocks are nearby.
Grimoire of the Lost Merchants Guild - Instantly levels up their profession level without doing any trades.
Golemsteel Brazier - Lure Villagers and guards to you and have them follow you as long as you hold this.
Llama Key - Free Wandering Trader llamas from captivity, converting them to normal.

Take a look at the screenshots to see what you can expect from this mod. This is a Forge mod and download links are given below. Read the installation instructions carefully.

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Village Artifacts Mod