Needs review
Source: Dragon Magazine #343

Description: You can climb without dropping your guard.

Prerequisites: DEX 15, Athletic

You can move freely enough to avoid some blows while climbing. By accepting a -10 penalty on your Climb check, you can retain your Dexterity bonus to AC while climbing.

In addition, you do not need to make a Climb check when you take damage while climbing.

Normal

When climbing you lose your Dexterity bonus to AC unless you take a -20 penalty on the check, and you must make a Climb check every time you take damage