Attack
Certain monsters can give your units improved attacks, allowing you to more easily defeat enemies. Combining the Animal Hide or the Demon Tooth with the Fire Stone summons the Demon, which grants all your units flame attack powers. To summon Frosty and earn frost attack abilities for all your units, combine the Fire Stone or the Cursed Bone with the Blue Crystal. Combining the Demon Tooth or the Oak Leaf with the Cursed Bone summons the Serpent, which bestows upon all units dodge and poison attacks. To summon the Savage and earn lifedrain abilities for all your melee units, combine the Demon Tooth or the Cursed Bone with the Monster Claw.
Damage
Summoning certain monsters can either make your units invulnerable or allow them to inflict double damage on enemies. Combine the Animal Hide with the Demon Tooth to summon the Guardian and gain invulnerability to all missile attacks. Combining the Animal Hide with the Blue Crystal or combining the Fire Stone with the Cursed Bone summons Blade, which gives all melee units double damage.
Healing
Some summoned monsters heal your units or sap health points from your enemies. Combining the Oak Leaf with the Blue Crystal or the Animal Hide summons Seraph, which allows all your units to heal over time. Conversely, combining the Animal Hide with the Cursed bone or combining the Oak Leaf with the Fire Stone summons the Reaper, which causes all enemies to lose health points over time.
Movement
Summoning monsters can also affect the speed with which both you and your enemies move. Combining the Demon Tooth or the Monster Claw with the Oak Leaf summons the Treeant, which forces all enemies to move at half speed. Combining the Blue Crystal with either the Monster Claw or the Demon Tooth summons the Fox, which allows all your units to move at twice the normal speed.