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No, characters do not automatically fail a death saving throw upon dropping to zero hit points.

The Players Handbook explains (see "Dropping to 0 Hit Points" in the Combat chapter) that upon dropping to 0 HP, characters either die instantly or fall unconscious. If they're unconscious, then during the following turns they must succeed three death saving throws to stabilize, or fail three death saving throws to die.

On your third success, you become stable (see below). On your third failure, you die.

Normally, a creature can fail death saving throws for one of two reasons:

• They begin their turn with 0 HP. They attempt the death save, and fail. This counts as 2 failures if the result was a natural 1.

• They are already at 0 HP, and then take damage from another attack or effect. This counts as 2 failures if the damage is caused by an attacker's critical hit.

The rules do not say the character automatically fails one save when they first fall unconscious. Otherwise the character would die after only two failures, and there would be no reason to count the third failure. Therefore, your DM's ruling does not match the basic rules.

It's possible that your DM is misinterpreting the following text:

Damage at 0 Hit Points. If you take any damage while you have 0 hit points, you suffer a death saving throw failure.

... But this rule only occurs while the creature has 0 HP, so the initial damage that had dropped them to 0 HP would not qualify.

Note that a creature cannot be below 0 HP. Zero is the minimum. If a creature has (or falls to) 0 HP, and the remaining damage equals or exceeds their HP maximum, then they die. But they cannot have negative HP.

Also note that exceptions may exist. For example, there could be an especially nasty creature whose attacks inflict one failed death save upon dropping a creature to 0 HP. Such a feature would need to explicitly mention this behavior, otherwise it would function as per the basic rules.

No, characters do not automatically fail a death saving throw upon dropping to zero hit points.

According to the basic rules, under "Dropping to 0 Hit Points" in the Combat chapter, a character either dies instantly or falls unconscious when they drop to 0 HP. If they're unconscious, then during the following turns they must succeed three death saving throws to stabilize, or fail three death saving throws to die.

On your third success, you become stable (see below). On your third failure, you die.

Normally, a creature can fail death saving throws for one of two reasons:

• They begin their turn with 0 HP. They attempt the death save, and fail. This counts as 2 failures if the result was a natural 1.

• They are already at 0 HP, and then take damage from another attack or effect. This counts as 2 failures if the damage is caused by an attacker's critical hit.

The rules do not say the character automatically fails one save when they first fall unconscious. Otherwise the character would die after only two failures, and there would be no reason to count the third failure. Therefore, your DM's ruling does not match the basic rules.

It's possible that your DM is misinterpreting the following text:

Damage at 0 Hit Points. If you take any damage while you have 0 hit points, you suffer a death saving throw failure.

... But this rule only occurs while the creature has 0 HP, so the initial damage that had dropped them to 0 HP would not qualify.

Note that a creature cannot be below 0 HP. Zero is the minimum. If a creature has (or falls to) 0 HP, and the remaining damage equals or exceeds their HP maximum, then they die. But they cannot have negative HP.

Also note that exceptions may exist. For example, there could be an especially nasty creature whose attacks inflict one failed death save upon dropping a creature to 0 HP. Such a feature would need to explicitly mention this behavior, otherwise it would function as per the basic rules.

By default, characters do not automatically fail a death saving throw upon dropping to zero hit points.

The Players Handbook explains (see "Dropping to 0 Hit Points" in the Combat chapter) that upon dropping to 0 HP, characters either die instantly or fall unconscious. If they're unconscious, then during the following turns they must succeed three death saving throws to stabilize, or fail three death saving throws to die.

On your third success, you become stable (see below). On your third failure, you die.

Normally, a creature can fail death saving throws for one of two reasons:

• They begin their turn with 0 HP. They attempt the death save, and fail. This counts as 2 failures if the result was a natural 1.

• They are already at 0 HP, and then take damage from another attack or effect. This counts as 2 failures if the damage is caused by an attacker's critical hit.

The rules do not say the character automatically fails one save when they first fall unconscious. Otherwise the character would die after only two failures, and there would be no reason to count the third failure. Therefore, your DM's ruling does not match the basic rules.

It's possible that your DM is misinterpreting the following text:

Damage at 0 Hit Points. If you take any damage while you have 0 hit points, you suffer a death saving throw failure.

... But this rule only occurs while the creature has 0 HP, so the initial damage that had dropped them to 0 HP would not qualify.

Note that a creature cannot be below 0 HP. Zero is the minimum. If a creature has (or falls to) 0 HP, and the remaining damage equals or exceeds their HP maximum, then they die. But they cannot have negative HP.

Also note that exceptions may exist. For example, there could be an especially nasty creature whose attacks inflict one failed death save upon dropping a creature to 0 HP. Such a feature would need to explicitly mention this behavior, otherwise it would function as per the basic rules.

No, characters do not automatically fail a death saving throw upon dropping to zero hit points.

The Players Handbook explains (see "Dropping to 0 Hit Points" in the Combat chapter) that upon dropping to 0 HP, characters either die instantly or fall unconscious. If they're unconscious, then during the following turns they must succeed three death saving throws to stabilize, or fail three death saving throws to die.

On your third success, you become stable (see below). On your third failure, you die.

Normally, a creature can fail death saving throws for one of two reasons:

• They begin their turn with 0 HP. They attempt the death save, and fail. This counts as 2 failures if the result was a natural 1.

• They are already at 0 HP, and then take damage from another attack or effect. This counts as 2 failures if the damage is caused by an attacker's critical hit.

The rules do not say the character automatically fails one save when they first fall unconscious. Otherwise the character would die after only two failures, and there would be no reason to count the third failure. Therefore, your DM's ruling does not match the basic rules.

It's possible that your DM is misinterpreting the following text:

Damage at 0 Hit Points. If you take any damage while you have 0 hit points, you suffer a death saving throw failure.

... But this rule only occurs while the creature has 0 HP, so the initial damage that had dropped them to 0 HP would not qualify.

Note that a creature cannot be below 0 HP. Zero is the minimum. If a creature has (or falls to) 0 HP, and the remaining damage equals or exceeds their HP maximum, then they die. But they cannot have negative HP.

Also note that exceptions may exist. For example, there could be an especially nasty creature whose attacks inflict one failed death save upon dropping a creature to 0 HP. Such a feature would need to explicitly mention this behavior, otherwise it would function as per the basic rules.

By default, characters do not automatically fail a death saving throw upon dropping to zero hit points.

The Players Handbook explains (see "Dropping to 0 Hit Points" in the Combat chapter) that upon dropping to 0 HP, characters either die instantly or fall unconscious. If they're unconscious, then during the following turns they must succeed three death saving throws to stabilize, or fail three death saving throws to die.

On your third success, you become stable (see below). On your third failure, you die.

Normally, an unconscious character would attempt this saving throw at the start of their turn. They do not automatically fail the save when they first fall unconscious, otherwise the character would die after two failures instead of three. Therefore, your DM's ruling does not match the basic rules.

However, a character can automatically fail death saving throws if they continue to take damage after falling to 0 HP. It is possible that your DM is misinterpreting this rule.

Damage at 0 Hit Points. If you take any damage while you have 0 hit points, you suffer a death saving throw failure. If the damage is from a critical hit, you suffer two failures instead. If the damage equals or exceeds your hit point maximum, you suffer instant death.

Note that there may be special cases here, such as a specific effect that explicitly causes the victim to fail a death saving throw upon falling to 0 HP. However, that would be an exception, and is not the general rule.

By default, characters do not automatically fail a death saving throw upon dropping to zero hit points.

The Players Handbook explains (see "Dropping to 0 Hit Points" in the Combat chapter) that upon dropping to 0 HP, characters either die instantly or fall unconscious. If they're unconscious, then during the following turns they must succeed three death saving throws to stabilize, or fail three death saving throws to die.

On your third success, you become stable (see below). On your third failure, you die.

Normally, a creature can fail death saving throws for one of two reasons:

• They begin their turn with 0 HP. They attempt the death save, and fail. This counts as 2 failures if the result was a natural 1.

• They are already at 0 HP, and then take damage from another attack or effect. This counts as 2 failures if the damage is caused by an attacker's critical hit.

The rules do not say the character automatically fails one save when they first fall unconscious. Otherwise the character would die after only two failures, and there would be no reason to count the third failure. Therefore, your DM's ruling does not match the basic rules.

It's possible that your DM is misinterpreting the following text:

Damage at 0 Hit Points. If you take any damage while you have 0 hit points, you suffer a death saving throw failure.

... But this rule only occurs while the creature has 0 HP, so the initial damage that had dropped them to 0 HP would not qualify.

Note that a creature cannot be below 0 HP. Zero is the minimum. If a creature has (or falls to) 0 HP, and the remaining damage equals or exceeds their HP maximum, then they die. But they cannot have negative HP.

Also note that exceptions may exist. For example, there could be an especially nasty creature whose attacks inflict one failed death save upon dropping a creature to 0 HP. Such a feature would need to explicitly mention this behavior, otherwise it would function as per the basic rules.