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Threshold, by David Palmer, published 1985.

• The Isi are humanoid and come from a very hostile planet.

• Rich industrialist on Earth, check: Peter Cory.

• Magic, transformations, crash landing, dragonoid form, friendly large flying creature, setup, all check. Your description is remarkably accurate for a book you read so long ago!

• There were indeed supposed to be sequels, but unfortunately they have yet to be published.

• This would appear to be the cover you're remembering.

Threshold, by David Palmer, published 1985.

• The Isi are humanoid and come from a very hostile planet.

• Rich industrialist on Earth, check: Peter Cory.

• Magic, transformations, crash landing, dragonoid form, friendly large flying creature, setup, all check. Your description is remarkably accurate for a book you read so long ago!

• There were indeed supposed to be sequels, but unfortunately they have yet to be published.

This would appear to be the cover you're remembering:

Threshold, by David Palmer, published 1985.

• The Isi are humanoid and come from a very hostile planet.

• Rich industrialist on Earth, check: Peter Cory.

• Magic, transformations, crash landing, dragonoid form, friendly large flying creature, setup, all check. Your description is remarkably accurate for a book you read so long ago!

• There were indeed supposed to be sequels, but unfortunately they have yet to be published.

• This would appear to be the cover you're remembering.

Threshold, by David Palmer, published 1985.

• The Isi are humanoid and come from a very hostile planet.

• Rich industrialist on Earth, check: Peter Cory.

• Magic, transformations, crash landing, dragonoid form, friendly large flying creature, setup, all check. Your description is remarkably accurate for a book you read so long ago!

• There were indeed supposed to be sequels, but unfortunately they have yet to be published.

• This would appear to be the cover you're remembering.

Threshold, by David Palmer, published 1985.

• The Isi are humanoid and come from a very hostile planet.

• Rich industrialist on Earth, check: Peter Cory.

• Magic, transformations, crash landing, dragonoid form, friendly large flying creature, setup, all check.

• There were indeed supposed to be sequels, but unfortunately they have yet to be published.

• This would appear to be the cover you're remembering.

Threshold, by David Palmer, published 1985.

• The Isi are humanoid and come from a very hostile planet.

• Rich industrialist on Earth, check: Peter Cory.

• Magic, transformations, crash landing, dragonoid form, friendly large flying creature, setup, all check. Your description is remarkably accurate for a book you read so long ago!

• There were indeed supposed to be sequels, but unfortunately they have yet to be published.

• This would appear to be the cover you're remembering.