Adult Red Dragon

If the monster fails a saving throw, it can choose to succeed instead.

The monster makes three Rend attacks. It can replace one attack with a use of Spellcasting to cast Scorching Ray.

Melee Attack: +14 to hit. reach 10 ft. Hit: 1d10 + 8 slashing plus 2d4 fire damage.

Dexterity Save: DC 21. target: 60-foot-long, 5-foot-wide cone, creature. Failure: 17d6 fire damage; success: half.

The monster uses Spellcasting to cast Command (level 2 version). The monster can't take this action again until the start of its next turn.

You speak a one-word command to a creature you can see within range. The target must succeed on a Wisdom saving throw or follow the command on its next turn. Choose the command from these options:Approach. The target moves toward you by the shortest and most direct route, ending its turn if it moves within 5 feet of you. Drop. The target drops whatever it is holding and then ends its turn. Flee. The target spends its turn moving away from you by the fastest available means. Grovel. The target has the Prone condition and then ends its turn. Halt. On its turn, the target doesn't move and takes no action or Bonus Action. Using a Higher-Level Spell Slot. You can affect one additional creature for each spell slot level above 1.

The monster casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (+12 to hit with spell attacks): At Will: Command (level 2 version), Detect Magic, Scorching Ray 1/Day: Fireball

You speak a one-word command to a creature you can see within range. The target must succeed on a Wisdom saving throw or follow the command on its next turn. Choose the command from these options:Approach. The target moves toward you by the shortest and most direct route, ending its turn if it moves within 5 feet of you. Drop. The target drops whatever it is holding and then ends its turn. Flee. The target spends its turn moving away from you by the fastest available means. Grovel. The target has the Prone condition and then ends its turn. Halt. On its turn, the target doesn't move and takes no action or Bonus Action. Using a Higher-Level Spell Slot. You can affect one additional creature for each spell slot level above 1.

For the duration, you sense the presence of magical effects within 30 feet of yourself. If you sense such effects, you can take the Magic action to see a faint aura around any visible creature or object in the area that bears the magic, and if an effect was created by a spell, you learn the spell's school of magic. The spell is blocked by 1 foot of stone, dirt, or wood; 1 inch of metal; or a thin sheet of lead.

You hurl three fiery rays. You can hurl them at one target within range or at several. Make a ranged spell attack for each ray. On a hit, the target takes 2d6 Fire damage. Using a Higher-Level Spell Slot. You create one additional ray for each spell slot level above 2. Total Rays

A bright streak flashes from you to a point you choose within range and then blossoms with a low roar into a fiery explosion. Each creature in a 20-foot-radius Sphere centered on that point makes a Dexterity saving throw, taking 8d6 Fire damage on a failed save or half as much damage on a successful one. Flammable objects in the area that aren't being worn or carried start burning. Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 3.

The monster uses Spellcasting to cast Scorching Ray. The monster can't take this action again until the start of its next turn.

You hurl three fiery rays. You can hurl them at one target within range or at several. Make a ranged spell attack for each ray. On a hit, the target takes 2d6 Fire damage. Using a Higher-Level Spell Slot. You create one additional ray for each spell slot level above 2. Total Rays

The monster moves up to half its Speed, and it makes one Rend attack.