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A miniboss is similar to a normal boss, but it is generally weaker in every way.

They have less HP, less defense, and lower attack power.
They also drop lower quality items than normal bosses as well.

The easiest way to determine whether a boss is actually a miniboss is to:

  1. See if it has any special attacks. Not having special attacks indicated a miniboss
  2. See if it spawns with other bosses or minibosses. If it does, it's a miniboss

The Knife of White Shadows, which spawns in every clan base, is generally considered a miniboss because it has no special attacks.