Good afternoon, if we're talking about Tier 3 alternative creatures, then you're right, their additional ability is a special attack pattern; they can hook three enemies at once with their scythe (technically, this is analogous to the "splash" attack of dryads).
Don't you think that giving a non-physical creature with such an attack even more additional abilities would be too overpowered...? By the way, their speed and initiative are also 1 unit lower than their counterparts because of this.
Ah, that's what it is. I should have tested them in battle first...