When the Character battle step starts, if this unit is in the Character arena, choose one: this unit gets +20 speed, or this unit gets +2 power until the end of battle.
Shields 1
Keywords
Shields
Shields X: A cumulative, static ability that means, "The attacking unit gets –X power against this unit." Shields only matters when attack dice are rolled. If you give a unit Shields after your opponent has rolled for damage, it doesn't affect the roll.