Health Points (HP)

HP (Hit Points or Health Points in most RPGs) is the level of Endurance that determines the damage a monster or the protagonist can take before dying. The protagonist's maximum HP starts at 20 and only increases when their LV does. Resting at the Inn or MTT resort Bedroom fully heals and raise the protagonist's HP 10 points above its cap. HP can also be restored through consumable items or interacting with a SAVE Point.

An attack hitting the receiving party lowers their HP. The loss is dependent on the attacking party's Attack and the party of receipt's Defense. Upon reaching 0 HP, the protagonist's SOUL snaps in half and shatters, sending them to the GAME OVER screen. If a monster's HP reaches 0, they disintegrate into dust and reward the protagonist with EXP and w:c:Undertale:GOLD.

HP has been abbreviated for Horsepower or Hit Poodles from w:c:Undertale:Aaron and the w:c:Undertale:Dog Salad's info Checks respectively.

RIFTALE
For RIFTALE, HP can optionally be used for Health as well, not only Hit Points. Magic effects like KR leave a poison effect that gradually reduces the Health from a character in battle.

It's also encouraged to consider all the damage in UT (including from magic attacks) as physical damage. An explanation for this, is that the monster food, is magical, transforming completely into energy after being eaten, as well for healing the HP. Open wounds receives a boost to get healed instantly, burnt injures are instantly healed and electric damage is nullified to the extent of how much HP was healed. No matter what was the injury or wound. Monster food heals everything.