HP Monsters can be recognized by the fact that, where on an ordinary Effect Monster it would read 'Effect', HP Monsters have 'HP'.
HP monsters are a special type of Effect Monster with (Type)/HP in their card text. The HP monsters have the following effects: This card cannot be set. When this card is in defense position, change it to face-up attack position instantly. When this card is attacked by other monster and ATK of that monster is higher than this card, this card will remains on the field, no damage done to your life point, and decrease DEF of this card equal to the difference of the ATK. If DEF of this card is 0 or below, send this card to your graveyard.
Some cards may have additional effects as well.
There is no card with this type yet, but there will be soon.
A = HP Monster. 2 stars. ATK/DEF = 500/200 B = Normal Monster. 3 stars. 600/1000 C = Normal Monster. 5 stars. 1000/500
Player 1 : Summon "A" attack position to the field.
Player 2 : Use "Nagate Attack" Magic card to "A". -> "A" changes to defense position, then changes to attack position instantly.
Then summon "B" attack position to the field. Then order "B" to attack "A". -> "A" is not sent to graveyard, Player 1 lose no life point, and "A"'s DEF is reduced to 100.
Player 1 : End turn.
Player 2 : Tribute "B" and summon "C" attack position to the field. Then order "C" to attack "A". -> "A" is not sent to graveyard, Player 1 lose no life point, and "A"'s DEF is reduced to -400. Then "A" is sent to the graveyard.