To clip the wings of an ophanim, one must be exceedingly careful. Their wings are not true wings; they permeate their bodies entirely. An ophanim without wings is no more alive than a chunk of celadon, for the wings are the body.
To extract the offal of a cherubim, merely read their true intentions. They are nervous creatures, easy to exploit. When forced to confront their own dishonesty, they will sag with the weight of their own heads. At this point it is safe to vivisect them, as their bodies are vacant of all virtue.
To abash the holiness of a seraph takes the mildest of trenchancy. Anyone can, with the right application of blasphemy, bring low even the highest order of angel. When their shine grows greatest, fear not. They are only trying to discourage you. The weaker creatures will try to salvage the kingdom, but you will have already won.