The Erosian Last Stand? It took a few turns to optimize it, but my successful run used Hilstara, Robin, Riala and Vhala, first turn, Shieldwall with Hilstara, Ice Lance with Robin and Ice with Riala on Erosian Striker and Defensive Rain with Vhala, second turn, Hold the line with Hilstara, Fire Lance with Robin and Fire with Riala on the Erosian Archer and Defensive Rain with Vhala, third turn, Hold the line with Hilstara, Lightning Lance with Robin and Lightning with Riala on the Elite Erosian Knight and Abstinence Arrow on the Erosian Reaper, fourth turn, Hold the line with Hilstara for the heal, Fire Lance with Robin and Fire with Riala on the Erosian Captain and Abstinence Arrow with Vhala on the Erosian Reaper if she is still alive, if not, the Erosian Succubus or Healer, fifth turn, Hold the line with Hilstara for the heal, Lightning Lance with Robin and Lightning with Riala on the Elite Erosian Soldier and Abstinence Arrow with Vhala on the Healer or Succubus, sixth turn if applicable, Vhala can handle the Healer or Succubus with Abstinence Arrow.