More Swords is 1.12.2 mod that adds over 20 new swords to the game. Many swords have complex recipes that require multiple pieces to craft, but in return they are very powerful. The blaze sword, for example, sets enemies on fire for 10 seconds and the iron greatsword has extra knock back that sends enemies flying backwards.
There are 8 new gems that spawn under the elevation of 16 that are very rare. Only one vein can spawn per chunk. One vein can have up to 4 gems at a time.