The eraser is good for big areas and broad strokes when tidying up originals. You can see me erasing in the video at the bottom of this post before I do my large black areas and/or toning.
The pencil is just redundancy. The brush pens are really fantastic tools. I use them every day. I refill them with Koh-I-Noor Rapidograph Ultradraw Waterproof Ink. You can fill them with the little refill cartriges that Pentel makes, which are great too, but I prefer to use ultradraw because I like the black it makes while being both cheaper and more environmentally conscionable than buying a bunch of little plastic capsules that require international shipping.
The Gray-tone 'Lightsaber' brush pen. It is awesome. Another studio-mate and friend, Ron Chan, gave it to me a long time ago and for a long time it was filled with pure ultradraw. One day I heard fellow Periscoper Jonathan Case say to some interns that 'you need to keep your waterbrushes wet or you'll ruin them.' This prompted me to fill my waterbrush with some water instead of ink because I hadn't been able to get to the art store. Kablamo. I had stumbled upon a fantastic tool that has been in constant use ever since. I only have the one and it is perfectly broken in. If I lost it or didn't have it, Tragedy Series would be in big trouble.
If you draw and you don't yet have one of these then you need to stop reading this and go buy one right now. It is the most useful item I own. There are countless uses for this thing. You will be really glad you got it. The name on it comes from Bern helmets. I just cut out the 'R' and add them to the front end of each ruler so they don't get accidentally absorbed by any of my studio friends.
I use this stuff all the time to hold drawings and reference materials in place.
I use this to fill in the number of the tragedy I'm doing for the day, on a chart I made, so I don't repeat the numbers or Sadness Reprieve letters.
Studio-mate-mentor-pal Steve Lieber buys this stuff in bulk and the rest of us buy from him. A page costs 50 cents or so and it is well worth it. I used to work on typing paper because I was poor and ridiculous.
Next time will be shorter and filled with drawings. Hooray!