I'm a recent level 80 elementalist and have skilled my Tempest specialization up to Singularity. I can wield a warhorn, but it doesn't give me any weapon skills. (I'm wielding the Tempest's Warhorn.) I only have weapon skills 1-3. When mouse overing the warhorn it also displays the text "Warhorn use requires the elite specialization Tempest (Level 80)" in red. How can I use warhorn skills?