QUOTE (Invoking Blood Spirits, page 139, Street Magic)
To use this advanced metamagic, magicians must first master both Sacrifice and Invoking. A blood sacrifice (during which the donor must be killed) is performed as part of the modified Invoking ritual. Rather than invoking an appropriate great form spirit from a bound spirit, the ritual transforms the bound spirit into a great form blood spirit.
QUOTE ( Corruption, page 143, Street Magic)
Corruption metamagic allows a toxic magician to pervert a spirit into a toxic version of itself. To corrupt a spirit, the toxic must first reduce the spirit's services to 0 with Banishing (see p. 180, SR4)... If the spirit is successfully brought into the magician's seervice, it immediately transforms into a toxic version of itself (see Toxic Spirits, p. 144).
And then there's standard Insect Spirits.
So here's how it goes down:
1) Insect Spirit shows up.
2) Toxic mage with Invoking, Sacrifice, and Invoking Blood Spirits hits the Insect Spirit with Banishing, and then Summoning to bring it into his service (or "Catch 'em all," as it were). This Corrupts the spirit, making a Corrupted Insect Spirit (I like the Anaphylaxis power).
3) Toxic mage binds the Corrupted Insect Spirit.
4) Toxic mage performs a blood sacrifice during an Invoking ritual. This turns the Corrupted Insect Spirit into a Great Form Blood Corrupted Insect Spirit, granting the Insect Spirit not only a Corrupted spirit Power, but also the spirit Powers listed for Blood Spirits.
5) Profit.
All the spirit Powers in question are located between pages 139 and 154, Street Magic. I personally like the idea of Soldier Beetle Blood Spirit with Mutagen. Or an Ant Queen Blood Spirit with Anaphylaxis.
So, for all you diabolical GMs out there that have veteran players and you want to throw them a curve ball... Enjoy.