As part of any move action or full action you take, you can
create a field of condensed, compressed entropy that forms in
place on one of your limbs to protect you as a basic riot shield
or basic tactical shield (you choose which each time you create
the shield). The shield has no bulk, but it otherwise functions
in all regards as a physical shield of the selected type. You can
dismiss the shield as part of any move or full action you take, and
it disappears at the end of your turn if you are not holding it.
At 5th level, your compressed entropy functions as a field riot or tactical shield. At 10th level, it functions as an advanced riot or tactical shield. At 15th level, it functions as an elite riot or tactical shield, and at 20th level, it functions as a paragon riot or tactical shield.