Moon Goddess Arete 

This was a long day for a 46 year old man. Not really hard, but long. I went up the day before and cut steps with a rock on the approach snow field. The first half of the climb goes pretty quick until the first tower. This is really the first exciting pitch. The ibrium tower has a nice 5.8 crack and traverse to belay. Be careful down climbing after this to long traverse to a gully. You regain the ridge and think your almost done but you're not. One thing that stood out to me was the protection was difficult. Stoppers did not place well. I think cams are preferable. I'm saying that and I'm old school. The way this rock has faulted seems to be more of a blocky thing with parallel sided cracks. . The route ends below the summit and it's recommended to go to the top for great views. We wanted to find the Rap to contact pass before it got really dark and skipped the summit. We did a double rappel off some really manky anchors in the dark and ended up about 100ft below the pass. I believe you can get off on 1 rappel if you get to the correct spot at the pass itself. it's a tough decent in the dark. (don't forget your headlamp on this one)

You are correct in your pro assessment. I usually carry double yellow and orange TCU's on these routes. Many seam type features do not hold nuts well on Temple Crag.

The double rap was down and to the right of the "best" rappel. It is extremely exposed to get to the "best" rappel but it lies right at the top of Contact Pass. I have done both ways and your way is a bit safer due to the scrambling you have to do to the "best" and also "shortest" (1 60m gets you down) rap.

Route-finding on the Ibrium Tower traverse is slightly tricky. Keep looking for the best place to move right, and don't go too high (although if you do, the climbing actually looks pretty good, just harder). The traverse itself is really class 4 if you take it right. The pitch leading back up to the top of the tower has some of the worst rock on the climb and there are many ways to go, some more solid than others. There is another alarmingly loose pitch leading up to the gendarme (I believe). Other than those two pitches, the rest of the climb is pretty solid.

When you are getting ready to traverse right around the Iberium tower, instead of traversing you can punch right up to the center of the tower. If you do these two alternative pitches you will be super stoked. They both go at 5.9 and are incredible, the first one is some kind of funky (but super fun) finger crack action, and the second is a "splitter" hand crack. This variation made the route for me, it was probably the best quality rock on the whole climb.

Agree with Jake here; Ibirium Tower direct cracks are the best climbing and rock on the route and make the route 5.9. This route has more loose rock than the Venusian Blind.

Onsight soloed this last summer. Some exposure, but as with many High Sierra routes it is not sustained. Added a photo with the route annotated on Ibrium Tower. Some loose rock, but I did not find it to be particularly sketchy.

Bring a topo if it's your first time to avoid unnecessary epics.

An historical perspective, this route (as well as Venitian Blind) was rated III, 5.6 in Steve Roper's "Climber's Guide to the High Sierra" in 1976.

That's the route description I used to climb the route in the 80's.