Either hike up Terror Creek trail to saddle near Chopping Block or cross the Barrier from McMillian Spire and Inspiration Peak Basecamp area. A small gravel field with a stream running through tucked away from wind. Once on saddle there is a small flat area on the rocks enough for 2-3 tents and two tent sites further along the ridge. From the ridge walk East away from the Chopping Block then drop down into the valley traversing the scree and talus to the base of the East Ridge about an hour to base of climb. Short snow field and scramble lets you take to ridge where the climb begins with a hand width crack.
Mount Terror is the peak center left. Traverse the scree filed, go up the snow field and the couloir to gain the ridge and get to base climb. The East Ridge route we took wrapped around to the south face then up to the summit, descending the West Ridge via gulley. First picture shows start of climb. Can be done with mountaineering boots just fine. The route goes up two pitches then traverses to the south face along some loose rock then wraps up again for two pitches with some 5th class rock mixed in.
Descend via the West Ridge 3-4th Class rock. Rappelling is a faster safer way to get down to the rap station on the West Ridge. Drop down into the gulley make sure to stay on the southern side of the mountain to enter Crescent Creek Valley. Continue down to a small drop 10-12ft above chock stone. Can be down climbed but is often wet so may need a quick rappel. Area does have the possibility of wells during later season so watch out for them as you descend to the snow field. Then traverse back across the valley to campsite 8-10 hours depending on conditions and team.