Can you make four attacks on the turn you cast Blade of Disaster?

Blade of Disaster is a new spell from the Icewind Dale: Rime of the Frostmaiden module and is found on pg. 318.

According to the spell description (emphasis mine):

When you cast this spell, you can make up to two melee spell attacks with the blade

The description then goes on to say:

As a bonus action on your turn, you can move the blade up to 30 feet to an unoccupied space you can see and then make up to two melee spell attacks with it again.

It seems that on the round that you cast this spell, you can get up to 4 total attacks. Am I reading this correctly?

Does the damage roll for an attack made by the effects of booming blade count as a damage roll made for booming blade?

This question is worded very specifically so think carefully about the wording before you answer. The description for booming blade goes as follows:

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you. On a hit, the target suffers the weapon attack’s normal effects and then becomes sheathed in booming energy until the start of your next turn. If the target willingly moves 5 feet or more before then, the target takes 1d8 thunder damage, and the spell ends.

If the damage roll made by the weapon also counts as a damage roll for the spell, then the damage roll would also be under the effects of things like the elemental adept feat since elemental adept specifies that the spell has to deal that damage and not the damage roll.

When you gain this feat, choose one of the following damage types: acid, cold, fire, lightning, or thunder. Spells you cast ignore resistance to damage of the chosen type. In addition, when you roll damage for a spell you cast that deals damage of that type, you can treat any 1 on a damage die as a 2.

Does it apply to the damage roll of the weapon or only the bonus thunder damage?

Can the spell Booming Blade be affected by the Twinned Spell metamagic?

Booming blade is a Sword Coast Adventurer’s Guide cantrip that allows the spellcaster to make a melee weapon attack with their weapon and add additional power to the attack:

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you. On a hit, the target suffers the weapon attack’s normal effects and then becomes sheathed in booming energy until the start of your next turn. If the target willingly moves 5 feet or more before then, the target takes 1d8 thunder damage, and the spell ends

Booming Blade, Sword Coast Adventurer’s Guide, pg. 142

The Twinned Spell metamagic permits a Sorcerer to take any spell that targets only a single creature, and cast it twice, targeting a different creature.

When you cast a spell that targets only one creature and doesn’t have a range of self, you can spend a number of sorcery points equal to the spell’s level to target a second creature in range with the same spell (1 sorcery point if the spell is a cantrip).

To be eligible, a spell must be incapable of targeting more than one creature at the spell’s current level. For example, magic missile and scorching ray aren’t eligible, but ray of frost and chromatic orb are.

Twinned Spell, Player’s Handbook, pg. 102

It has been commonly accepted that this is a valid use of this metamagic/cantrip combo, but a recent Errata to the spell has changed its range to "Self (5-foot radius)". Is this spell still eligible to be Twinned?

Does the material component of Booming blade need to the same one used in the attack?

Does the spell specify that the material component need be the same as the one used in the attack?

As part of recent errata to the green-flame blade and booming blade cantrips, their material components have been amended to "a melee weapon worth at least 1 sp" (Sword Coast Adventurer’s Guide, 142).

If not then can you use a separate sword for the component?

Can the blade created by Shadow Blade be used with the Booming Blade or Green Flame Blade cantrips?

The spell shadow blade allows a spellcaster to produce a discrete weapon that can then be used to make attacks:

You weave together threads of shadow to create a sword of solidified gloom in your hand. This magic sword lasts until the spell ends. It counts as a simple melee weapon with which you are proficient. It deals 2d8 psychic damage on a hit and has the finesse, light, and thrown properties (range 20/60). In addition, when you use the sword to attack a target that is in dim light or darkness, you make the attack roll with advantage.

Shadow Blade, Xanathar’s Guide to Everything, pg. 164

As part of recent errata to the green-flame blade and booming blade cantrips, their material components have been amended to "a melee weapon worth at least 1 sp" (Sword Coast Adventurer’s Guide, 142).

Can shadow blade still produce a weapon that can be used with these cantrips?

What are the repercussions of the Sword Coast Adventurers Guide errata to the cantrips Green-Flame Blade and Booming Blade?

In the most recent update to the Sage Advice article, Green-Flame Blade and Booming Blade have received errata to their range and spell text, being altered from

Range: 5 feet

to

Range: Self (5 foot radius)

Furthermore, the text of GFB and BB have been altered from

As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell’s range, otherwise the spell fails.

to the phrase

You brandish the weapon used in the spell’s casting and make a melee attack with it against one creature within 5 feet of you.

How do these changes alter the way that these spells are used, and how they interact with features or feats, such as Spell Snipers effect of doubling a spells range.

War caster feat and green flame blade, is it legit?

The War Caster feat allows a single-target spell (“must target only that creature”) to be cast instead of a melee strike for an opportunity attack.

Green-Flame Blade appears to have a single target, and then some damage “leaps” onto a creature 5 feet away. The other creature is never referred to as the target, or even “a target”.

I’m pretty sure this is solid from the RAW perspective. Is this legit from a RAI perspective?

if booming blade or green flame blade are counter-spelled, does the attack still go through?

Booming blade says:

As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell’s range.

Counterspell reads

You attempt to interrupt a creature in the process of casting a spell. If the creature is casting a spell of 3rd level or lower, its spell fails and has no effect.

Does counterspell interrupt the attack made in conjunction with casting booming blade?

Dnd 5e Green flame blade and Flames of Phlegethos stacking [duplicate]

I’m playing an eldritch knight, and I’m looking to optimize the damage of green flame blade. The feature “flames of Phlegethos” states that “When you roll fire damage for a spell you cast, you can reroll any roll of 1 on the fire damage dice, but you must use the new roll, even if it is another 1. Whenever you cast a spell that deals fire damage, you can cause flames to wreathe you until the end of your next turn. The flames don’t harm you or your possessions, and they shed bright light out to 30 feet and dim light for an additional 30 feet. While the flames are present, any creature within 5 feet of you that hits you with a melee attack takes 1d4 fire damage” would both the 1d4 fire damage and the re-roll 1’s on fire damage trigger when using green flame blade? Or is this meant for spells of level 1 and higher?

Dnd 5e question. Combination of green flame blade and the tiefling feature “flames of the nine hells”

I’m playing an eldritch knight, and I’m looking to optimize the damage of green flame blade. The feature “flames of the nine hells” states that “You deal 1d4 fire damage when hit by a melee attack and shed 30 feet of bright light after casting a fire spell, you can reroll 1s on spell fire damage rolls” would both the 1d4 fire damage and the re-roll 1’s on fire damage trigger when using green flame blade? Or is this meant for spells of level 1 and higher?