They all look like warriors to her, even the poor soldiers buried and corrupted...and she is not that. But perhaps she could get some lessons. Over time.
That time is not now, so the dwarrow withdraws twenty feet, backing up carefully away from the third fell. She calls upon Aryth to disrupt the eldritch energies animating the only corpse not currently squaring off with one of her companions (Fell #1). A thin bright thread connects her and the undead for just a flash before it's gone.
A thrum of power builds in the roots she summoned, waiting to be unleashed. But when it lets go...well this has only happened once before, but she recalls the roots were eventually destroyed by the effort of channeling Aryth's might, making their contribution an act of sacrifice.
"Those roots that grasp only at these Fell will break apart in about twenty seconds. Just be ready when the time comes!" Petra warns her friends of the impending loss of the earthly bonds ((lifettrap expires in 3 more rounds)).
Move action backward 20 feet to L11.
Cast disrupt undead (cantrip, 0 spell energy but 1 of 7 uses per day) ranged touch ray at Fell #1 now 35 feet away.
Spell Resistance and damage rolled, in case. No Save allowed.
Ranged touch attack roll at Fell #1 (so as to avoid penalty for firing into melee).
Rolls
Spell resistance in case - (d20+13)
(20) + 13 = 33
Ranged touch ray vs Fell #1 - (d20+5)
(15) + 5 = 20
Potential Disrupt undead damage - (d6)
(1) = 1