Spells

Conjuration The act of summoning one or more spirits with a predetermined purpose. The conjurer performs some type of ritual to call upon the spirit and often times this include using certain magic symbols drawn on the floor and/or altar. The conjurer will usually perform this at a specific time; Depending on what they are conjuring it could be done at a specific time during the day/night or according to the alignment of the planets. Incense, candles and potions are commonly used coupled with a specific spell to summon a spirit. – Pad of Definitions (2.01 In My Time of Dying), Official Website

Summoning Spells

Demon

As seen with Trevor and Nora in 5.12 Swap Meat, summoning a demon requires a bowl of unknown herbs, set a top the Sigil of Baphomet, with candles placed on each point of the pentagram. Once the altar is set-up, an invocation in Latin must be spoken:

Attenrobendum eos,
ad ligandum eos,
potiter eos,
coram me.

Once completed, any demon who hears the invocation will manifest in the nearest vessel.

Trevor holding the demon summoning ritual.

The demon summoning ritual.

Azazel

John summoning Azazel.

John Winchester uses a special summoning ritual to make contact with the demon Azazel in 2.01 In My Time of Dying. Some of the required ingredients for the ritual were: blood of the summoner, acacia, oil of Abramelin, six lit candles positioned on the Sigil of Azazel, and an Latin incantation:

Attenrobendum eos,
ad consiendrum,
ad ligandum eos,
potiter et solvendum,
et ad,
congregontum eos,
coram me.

Angel

Bobby and Rufus summoning Bobby's Reaper.

Reaper

While lying in a coma, dying and being pursued by a reaper, Bobby cooks up a plan to buy himself some time to wake up by trapping his reaper in his subconscious. Bobby and Rufus go about collecting the needed materials to summon the reaper, which includes: a crucifix, gold ore, hemlock, mace and blood, among other unknown ingredients. After painting a trapping sigil on the floor, the ingredients are set on fire as Bobby recites the phrase:

O theris tes, caleo se cai deo.

Which summons the reaper his location and traps him.

Weaponized Spells

Kevin using the demon bomb.

Demon Bomb

The demon bomb is a powerful spell that is inscribed on the demon tablet for the defense of mankind, it effects are deadly to both demon and host. The spell was discovered by Kevin Tran, after being kidnapped by Crowley and forced to translate the newly discovered demon tablet. Three of the known ingredients needed for the demon bomb include: West Bank witch hazel, the skull of an Egyptian calf, the tail of newt, that according to Kevin may or may not be extinct. Once properly mixed, the spell will release shock wave blasting and immolating any demons within it's radius, rendering the bodies nothing but scorch marks on a wall.

Due to the rare quality of ingredients, use of this spell is very difficult, as only demons or angels are procure the needed materials.

The witch killing spell used against Spencer.

Witch Killing Spell

The first usage of the witch killing spell was in 7.05 Shut Up, Dr. Phil, Bobby supplies Sam and Dean, with a list of ingredients, of which the only known was chicken feet. Sam and Dean attempt to use the spell to put a stop to Don and Maggie Stark, once the Starks were in the same room the contents of the bowl were lite aflame as Sam recited the incantation:

Furor divina virtute in infernum eam detrude.

However due to the chicken feet being rotten, the spell was ineffective against the Starks.

A second variation of the spell was used in 8.15 Man's Best Friend with Benefits, like the prior spell it's exact contents are unknown other than chicken feet, however this version of the spell takes a liquid form. When James Frampton confronts the witch Spencer, and engages him in a fight Sam and Dean arrive and use the spell like a Molotov cocktail, Sam lights the rag in that is in the bottle while reciting an invocation in Latin:

Ego voco impetu delere,
vos caelum et infernum.

A smoke then envelops Spencer causing his body to disintegrate.

Ingredients for the witch killing spell.

Ingredients for the witch killing spell.