Does Alberich’s special skill cap out at 5? My Alberich is third chevron in ascendancy and 49th level in that chevron. I cannot get him above the 5th level in his special skill. I have leveled him using only heroes of the same color and recently had two times in a row where the chance for the skill to increase was over 50%. I have always only leveled him with 10 heroes of the same color and at no time was the special skill increase chance below 26%. I have never had this much trouble with any other hero. I do not believe his special skill has increased with leveling since the first chevron.
I guess you are just having a bad luck streak and don’t worry you are not alone with this kind of issue. We all have one or two different heroes in each tier which don’t budge for a while how much ever you try. Think of It as just the game’s RNG not working in your favor. Hopefully it changes for better soon for you 
And here is proof below from one of the players on leaderboard, who has 8/8 special skill for Alberich before last ascension itself. Hope that clarifies and confirms there is no bug or glitch here 
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