What happens if a dragon lacrima of another element is implanted? In fairy tail, we know that the third generation dragon slayers have been taught dragon slayer magic by dragons and also that they have dragon lacrimas implanted.
If a dragon lacrima of an element of different type is implanted what will happen?  Will they gain two types of dragon slayer magic?
( For example if Sting is implanted with a fire element type dragon lacrima will he gain two types of dragon slayer magic? i.e. holy light type magic taught by Vicelogia and fire type magic gained from the lacrima)
Spoilers to recent Manga chapters, But to be put simply they gain the ability to use and presumably eat that element. This is shown by


   One of the Elite Members of the Alvarez Empire,God Serena, who used to be a wizard saint, rank 1, who had 8 Dragon Lacrima implanted into his body. 


This is shown when (Even Bigger Spoiler):


   he uses the Cavern, Purgatory, and Sea King Dragon slayer magics in rapid succession to beat down four wizard saints ranked 2,3,4,and 5. Draculos Hyberion, Wolfheim, Warrod Sequen, and Jura Neekis were all incapacitated by his 3 attacks of those 3 dragon slayer magics. He then prepared to finish them off with Gale Dragon Slayer Magic, but was interrupted before he used that one.