On heroes.ag, there is a text mod that fixes these kinds of "rough edges" in the descriptions; however, it is for version 3.0.
Another special ability is called "Banish":
"Special combat ability. Banish a portion of summoned creatures. The number of banished creatures depends on the hero's level."
That's how it worked in the original and "Hammers of Fate"; now it works differently and is significantly weakened. My fix:
"Special combat ability. Deals a small amount of damage to all enemy summoned creatures. The damage dealt depends on the hero's level."