Are my homebrew spells balanced?

[King_Namazu]

I used the spell designing guidelines in ultimate magic and compared them to a few spells, and well while I don't think they are as op as a few spells *looks a fireball* I wanna make sure my party won't s+%# a brick when I use them in combat.

The first is my spin on vomit swarm but for the wizard/sorcerer class
Black Swarm
School conjuration (summoning); Level Sorcerer/Wizard 4
CASTING
Casting Time 1 standard action
Components V, S, M (Dried Leech, Charcoal dust)
EFFECT
Range personal
Effect one swarm
Duration 1 round/level
DESCRIPTION
You can summon forth a swarm of Leeches, Centipedes, or Death Butterflies with the Dark Creature template that will attack all other creatures within its area. The swarm begins adjacent to you, but if no living creatures are within its area, it moves towards a target of your choosing.
You can choose a target for the swarm or change the swarm‘s target by spending a move action to concentrate on the swarm, otherwise it continues attacking the current target. If your caster level is at least 12th your swarm gains the advanced template as well

The second is for my own sorcerer reach touch spell build and my dissatisfaction at the lack of high level melee touch spells I could reach metamagic

Kiss of the Death Butterfly
School Necromancy; Level sorcerer/wizard 6
Casting Time 1 standard action
Components V, S, M (a Death Butterfly wing)
Effect Tendril of rotting energy
Range close (25 ft. + 5 ft./2 levels)
Target creature touched
Duration instantaneous
Saving Throw Fortitude partial; Spell Resistance yes
Description
You conjure a writhing tendril of rotting necrotic energy that consumes even the unliving such as constructs and undead. If you succeed at a ranged touch attack with the tendril, the target takes 1d6 points of damage per caster level (maximum 20d6) and must make a Fortitude save. On a failed save a living creature takes 1d6 Constitution damage,This also affects undead creatures, dealing 1d6 Charisma damage.

and the third is because of my personal beef with dragon breath being too expensive and fireball feeling overused

Cremation
School Evocation; Level arcanist 4, cleric/oracle 5, sorcerer/wizard 4.
CASTING
Casting Time 1 standard action
Components V, S, M (handful of ashes)
EFFECT
Range 30 ft.
Area cone-shaped burst
Duration instantaneous
Saving Throw Reflex half; Spell Resistance yes
DESCRIPTION
A conflagration of erie blue flame blasts outwards from your hand. You shoot a 30 ft cone of fire dealing 1d6 points of fire damage per caster level (maximum 10d6) If the target succeeds at its save, it takes half damage. Incorporeal undead take the full effect of this spell and corporeal undead take half again as much damage (+50%) from this spell.

Tell me what you think, my character is a necromancer that has beef with undead so that is sort of the theme, let me know if you think something needs a tweak or if I've buggered up somewhere :)

[Pizza Lord]

Other than some misspellings and the fact that I would change Kiss of the Death Butterfly's target from 'target creature touched' to just 'target creature', it looks okay to me.

One note for cremate, with a name like that I would almost expect a target creature to be reduced to dust (like disintegrate) if they die, ie. reduced to -CON or 0 hit points and destroyed in the case of undead (obviously incorporeal targets wouldn't). Give some actual cremation in there somewhere other than just really hot fire. It shouldn't be quite as good as disintegrate for its power level, of course. So maybe add in a Fort save or something to resist that if it would occur possibly.

[Goth Guru]

Kiss of the death butterfly should read, "Even constructs made of organic material". I don't think it was intended to rust Iron Golems or erode Stone Golems.