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The difference was this spell was meant to be used by the caster instead of a sacrifice.

It was an offering. The larger given, the larger possibility for something to happen. What one got depended on how much magic was given away, who it was donated to, and based on the hope that the creatures contacted this way wouldn't just... squish you.

Squishing was a real concern.

The more power put into it, the higher the 'request' is sent. And from what little he had translated (It wasn't in a foreign language, but it was written in English a long time ago by someone who was proud to have never completed a formal education), most people who did this ritual had interesting results.

Half of them simply had no response, and lost however much power they offered.

Of the remaining percentage, most got low gifts. The ability to see underwater from the surface, able to talk to goats, all kinds of random abilities. Apparently his snake talking skill, Parseltongue, was one such ability.

But those who had offered the most, ranging from 10% to 40% of their power (More math to figure those numbers out, it was between 0.25% to 1% of his magic) had the most significant and extreme reactions.

One would gain control of all wind, another had been turned inside out. One person gained complete control of his body to the smallest level, another gained unending flatulence. Massively explosive flatulence.

All the records agreed that the more magic permanently offered, the more drastic the reward or punishment.

http://www.fanfiction.net/s/12734706/1/