Shoes from the Tank Man

Origin
On June 4, 1989, students led a massive demonstration in Beijing, China to protest the use of martial law and to promote economic and political reforms. The military cracked down on protestors, shooting at those grouped in Tiananmen Square with assault rifles and tanks, killing between hundreds and thousands of protestors. Supporters were arrested and removed from office, foreign journalists were expelled and the government reduced all media coverage. The events were widely condemned by other nations for the unnecessary use of lethal force, resulting in economic sanctions and arms embargoes on China.

The morning after, an unidentified man in Beijing defied the military and stood in front of a column of Chinese Type 59 tanks. As the lead tank maneuvered to pass by the man, he repeatedly shifted his position in order to obstruct the tank's path. Although his daring actions were recorded and widely distributed as one of the century’s most famous photographs, the Tank Man’s identity has never been discovered.

Effects
The artifact can let the user become invincible to anything but words. Bullets, bombs and shrapnel will deflect off them while biological and elemental agents will have no harmful effects on the user. However, saying the right words, a reason why they will fail or how their cause is wrong, will render the person immobile and unable to move from where they stand.