1 Lum Rune + 1 Pul Rune + 1 Perfect Emerald + Exceptional Unique Weapon = Elite Version of Weapon (Single Player, Ladder Only)
This formula changes the base item type from the exceptional to elite version. For example a Cleaver is turned into a Small Crescent. This does NOT convert the item to the Elite Unique version of the Exceptional Unique Item. Unique item bonuses remain the same; only the item it's based on is upgraded. This can be used to upgrade Ethereal Items also. They will continue to be Ethereal after they are upgraded. Also if the item is socketed, then jewels or runes and their mods will also remain. source
I don't know, but there's nothing on Arreat Summit on this issue
The 50% bonus will be the same after upgrade. I upgraded an exeptional unique Eth helmet in D2 Res to elite. The bonus was still there after the upgrade.
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