2005-10-01 : A creature dealt lethal damage by Excruciator can be regenerated.

2005-10-01 : An effect may redirect Excruciator’s damage.

2005-10-01 : Damage prevention shields that would prevent this damage aren’t used up and they stick around for the next time something would deal damage.

2005-10-01 : Excruciator can deal damage to creatures with protection from red. (It can’t block creatures with protection from red, though.)

2005-10-01 : Replacement effects that don’t use the word “prevent” can replace Excruciator’s damage with something else. See Phytohydra and Szadek, Lord of Secrets, for example.