Protecto

Protecto (プロテクト) is a virus from Mega Man Battle Network 2. They never appear alone and they all need to be destroyed at the same time in one hit, otherwise, their HP restores back to their original amounts. Program Advances are highly recommended to defeat them.

There is a countdown timer on this virus starting at 10. When the timer reaches 0, the virus attacks with a field-wide explosion attack, dealing a total damage equal to one of the virus's HP. After the attack, the countdown resets back to 10 and starts over.

These viruses appear in specific locations of the WWW Areas and Secret Areas, usually blocking a way towards a boss or an item. They also always appear in threes of one variant and never mixed with any other virus. Upon their deletion at the specific locations, they never reappear again.

According to a posting by one of the Undernet's regulars on one of the boards in Battle Network 2, the Protecto Viruses were sold to World Three (WWW) by someone who makes his own viruses, he may have also sold it to the Administrator of the Undernet as well.

Trivia

 * The Protecto Virus bears some resemblance to Eden from Mega Man Legends.