I've been playing for.. oh.. dunno.. months, maybe a year or close to it.

I've never fused Rhazin.. cuz I've never needed to. 

He has dropped from shards for me, repeatedly. (REALLY wish there was an anti-dupe mercy system)

I currently have 2 Rhazins in inventory.

So.. why oh why MUST I fuse a 3rd Rhazin for missions?

I have the 4 Epics needed, but they are all pretty much full booked (due to duplicates). So I really do not want to feed these booked epics to fuse a 3rd Rhazin which will merely be food.

Yes I'm hoping additional duplicates of the epics drop, but who knows. I am delaying moving forward due to this mission.

So... Just let me feed Rhazin to fuse Rhazin. I'll get NOTHING extra other than the completion of the fuse, and subsequent mission. In fact, if I've booked the Rhazin I do have, I'll lose those books - so I'd be losing resources to complete the mission.

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Of note.. I faced the same dilema with Justicator ages ago.. had fully booked rares and a full booked Justicator... but had to feed rares to fuse again, even though I really didn't need Justicator. Lucky being an epic, getting additional duplicates of the rares necessary was much easier. But I had duplicate Justicators. If I could have simply used Justicator to fuse Justicator it woud have been better.