So 10% damage buff goes away as soon as you stop channeling. If you do not believe me look at your buff status when you use the skill. You will notice that immediately after leaving trance and moving you lose that 10%. Asylum I have macrod to <t>, and I can cast it 30 yalms away. And astrologian has to be standing where they want the ability to go off. I use Asylum all the time on tanks in dungeons cast safely from a range.