This is the super prominent and highball arete climbed from a sit and following it all the way to the tippy top!

More detailed beta if you want it:

Sit down start on the arete, climb up using arete tension and possibly an undercling out left. Using either good tension on the arete or a big move, gain the horizontal ledge hold. You can get a good stance matched on the arete and with feet on the ledge. Embrace your inner sport climber and try to depump a little for the upper crux. This is a good spot to bail if you are unsure. Steel your mind and continue up the arete making use of some holds out left. There is a left crimper or undercling pinch depending on your sequence. Grab the big horn using one of several methods and make one more dicey sequence to grab the lip! The lip is good. Traversing left a little bit makes the topout not so bad. I advise going up and making sure the lip holds are not wet before making an attempt. I would break this down as a V5 first half into a V4 upper half. 

Zenith and it's neighboring line to the left are essentially the same topout with different starts. Since the different starts are distinct different cruxes, it seems to make sense to add them as separate lines. 

It is worth mentioning that Zenith is essentially the continuation of Bill Patton's Slapjack, finishing all the way up the arete instead of rocking onto the slab. 

On the same boulder as Penumbra. This is the super obvious arete that is one of the first things you see when you enter the bat cave area. 

Pads! Some rope rehearsal for the top is a good idea. I would recommend 5 pads at least.