The Raid Achievements for the Ulduar raid “Glory of the Ulduar Raider” normally comes in 10 and 25 man.
The 10 man mount reward was Reins of the Rusted Proto-Drake
The 25 man mount reward was Reins of the Ironbound Proto-Drake
When patch 7.3.5 hits live servers, these achievements will be merged as one.
No matter if you have completed the 10 or 25 or both, you will get both 10 and 25 mount rewards.
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