I've been really trying to come up with a build for tempest that works for a lot of different game modes (open world, dungeons/fractals, wvw) and this is what I've been using. So far I've solo'd almost every dungeon, several fractals, and most of the hero points that normally require a group using this build. It is certainly not the "optimal" build for fractals, as the dps isn't that high. I usually hover around 12-15k dps. 300 healing power seems to be the sweet spot to boost up some of the water skills healing ability, I'm usually able to heal from 25% health to full without using my healing skill at all. So the survivability is pretty good, at least.
I'd really like to keep my warhorn as one of my weapons, but I've messed around with both dagger and scepter and I think scepter might be better overall, since you can kite when your defensives are on cooldown. Does anyone have any suggestions or tips to improve this at all? One thing I've struggled with a bit is break bars, I can break them by myself but it requires a near perfect rotation of CC skills to do it. Other than that it's been working really well for me thus far, so if anyone is looking for a good solo-friendly build give this a shot!