Circle of Unstable Metamorphosis
Circle of Unstable Metamorphosis is a static projectile spell that erects a circular field of volatile transformative magic, applying 
Chaos polymorph which turns creatures inside into something else. It does not affect you unless using Piercing Shot; it also does not affect you if using Piercing Shot together with Nolla. Transformed creatures may drop gold nuggets or other drops typical for the form they have turned into.
Tips
Preserves the 
Charmed status of creatures from Summon Egg; requires Piercing Shot to be able to apply to them. E.g., to summon an egg "containing" one or two random charmed creatures that turns into charmed Hurtta after some time:
Here, the Reduce Lifetimes and Spiral Arc are used for timing adjustments to roughly match the delay between an egg breaking and the summoned creature hatching, while the Digging Blasts are to prevent unintended spell wrapping. (For the tightest possible timing, use an Increase Duration and Chain Spell in place of the Spiral Arc.) If unwanted dangerous creatures are produced and one is outside of battle, one can simply wait for unwanted creatures to revert to Hurtta. They can also be pared down more quickly without generating blood, corpses, or retaliation, but possibly producing hit-triggered switching and death-triggered explosions and hostile summons, using a wand such as the following:
Replacing the Venomous Curse here with an Electric Charge here allows one to obtain desirable corpses without retaliation, but with a little blood and dangerous death triggers. This may be useful for obtaining gold and Stinky Meat. (Unfortunately, Circle of Transmogrification does not work on any of these already-polymorphed creatures, so automatically filtering down to a small set of creature types including Muodonmuutosmestari, the most notable of which is the set of polymorph-immune creature types, may not be simple.)
Special properties of Mists and certain damage types assist in making cleaner, more robust farms and harvesting. E.g., the following design deals with some annoying creatures such as Ukkoshyypiö while leaving some useful ones such as Turvattomuusmestari and Haavoittajamestari, though it does not filter all threatening creatures and can anger them (e.g., Maadoittajamestari, Skoude), the lack of a Drilling Shot can deactivate the mists prematurely, and the low fire rate and mists preventing eggs from breaking slows things down, and other annoyances such as creature explosions remain.
Other summoning spells can also be used to feed random creature generators, including those from Projectile Transmutation Field. This enables other approaches to farming drops more convenient than dealing with Summon Eggs. E.g., to use a Spark Bolt With Timer positioned to go off in mid-air, summoning a random hostile creature, eliminating lower-health ones immediately and leaving corpses, and some higher-health ones without leaving corpses, reducing terrain destruction from on-death explosions, but not handling some annoyances such as creatures with shields, on-hit swapping, on-death material and hostile mob generation, and lag accumulation between trips to pick up gold:
Summon Deercoy can also be polyed, and keep the limited lifetime and explosion on death. Alternative farm wand build using deercoy:
Some of these components may be useful in building dedicated gold, Teleportatium, Stinky Meat, or other farming wands. Unloading non-charmed, polymorphed enemies (e.g., by mod restarting or by quickly moving far away from them) will make their polymorph permanent, so permanent living enemies of certain kinds can be summoned as well.
As of the 2023-03-11 patch, creatures can (once again) polymorph into Jalkamatkatavara if one has been killed before, enabling one to build a Leggy Mutation farm (with less care than required for building a meat farm), which, paired with perk reroll machines, provides at least a limited form of general perk farm.
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See Also
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