Good news, you still look human from the waist up. Bad news, you're attached to a very large spider body. Hopefully you're not arachnophobic.
You can climb walls and ceilings with your spider legs. You can also produce silk with your spinnerets and weave it, the silk is much more resistant than regular spider's silk. You gain a minor Tinker 0 power to easily weave clothes and various constructs from your silk.