I don't know Akiza, I feel that 30 seconds would have a bigger impact than you are thinking. Even sneak attack with 500 potency is on a minute cool down. In a long fight like Bahamut not so bad, but the rest of the game.... I can picture running dungeons and dropping rouse/spur enkindle on large pulls for 500-600 potency per mob, every single pull. it would be more "summonerish", but that is a whole other conversation. We are currently not a nuke class and that would start us on that path.