MMOItems

Crucible can act as a bridge to allow MythicMobs skills to be used with MMOItems as well (or theoretically any compatible item-generating plugin).

Once Crucible is installed, you can add skills to an MMOItem by doing the following:

Create a "Dummy Item" in MythicMobs that contains the skills you want

LavariteSword:
  Id: STICK   # doesn't matter since it's a dummy item
  Skills:
  - skill{s=[
        - effect:particleline{p=flame;amount=5;speed=0.1;yOffset=0.45;hO=0.5;vO=0.5}
        - damage{amount=10;element=FIRE}
        - ignite{ticks=100}
    ]} @target ~onUse

None of the settings on the item matter, because it's just a dummy item there to act as an anchor for the skills.

Add a special NBT tag to your MMOItem

Once you've created your dummy MythicMobs item, you just have to go add the appropriate NBT tag to your MMOItem.

Edit your MMOItem
Click NBT Tags to add an NBT tag
Enter: MYTHIC_TYPE [dummy_item_name]
That's it!

After you add the NBT tag to your MMOItem, the MMOItem will act as though it has the same skills as the dummy item you created.