Is the additional effect of Radiance of the Dawn dependent on the first effect?

The Light Domain Cleric Channel Divinity: Radiance of the Dawn has two effects:

As an action, you present your holy symbol, and any magical darkness within 30 feet of you is dispelled. Additionally, each hostile creature within 30 feet of you must make a Constitution saving throw. https://www.dndbeyond.com/sources/phb/classes#LightDomain

Is the additional effect dependent upon the first effect? i.e. does the Channel Divinity require the presence of magical darkness within range before it can be used?

If an item produces the effect of a spell, can I dispel it?

Some magic items, like a Potion of Growth or Oil of Slipperiness, produce the effect of a spell. For example:

When you drink this potion, you gain the “enlarge” effect of the enlarge/reduce spell for 1d4 hours (no concentration required).

When a magic item produces the effect of a spell, can this effect be ended by dispel magic in the same manner as the actual spell?

(Note that I’m not asking about items that actually allow the user to cast spells, such as a Wand of Magic Missiles.)

Would a slow effect block a hunter ranger from using volley or whirlwind attack?

The Slow spell includes this rule for any creature affected by it:

Regardless of the creature’s Abilities or Magic Items, it can’t make more than one melee or ranged Attack during its turn.

A Ranger who is followed the hunter archetype gets access to volley and whirlwind attack at level 7:

Volley:

You can use your action to make a ranged Attack against any number of creatures within 10 feet of a point you can see within your weapon’s range. You must have Ammunition for each target, as normal, and you make a separate Attack roll for each target.

Whirlwind Attack:

You can use your action to make a melee Attack against any number of creatures within 5 feet of you, with a separate Attack roll for each target.

As I understand it, both of these abilities are considered to be a single attack, albeit with multiple attack rolls. Does that mean the slow spell would not prevent a ranger from using either ability if they were under it’s influence?

How does the Hide from Undead spell interact with the effect of an Invisibility Purge spell?

Take a group of adventurers trying to get the drop on a lich or any other intelligent undead. They decide to use the spell hide from undead to get into position. What they don’t know is that the undead is cautious and has something producing an invisibility purge effect, like a lantern of revealing.

The hide from undead spell description says:

Undead cannot see, hear, or smell creatures warded by this spell.

But it’s not listed as being invisible, and the invisibility spell’s school is actually illusion (glamer) whereas hide from undead‘s is abjuration.

Would hide from undead keep the adventurers from being seen? Or would the invisibility purge effect make them visible?

Can this “Bloody Fervor” effect be ended by a Calm Emotions spell?

In a recently published AL-Legal module contained within Pipyap’s Guide to All the Nine Hells (available on the Dungeon Masters Guild), there is a “Bloody Fervor” effect (minor spoilers below) :

For every hour spent inside the Gorge, a creature must make a DC 25 Wisdom saving throw. If they fail, they must attack the nearest creature in the Gorge that succeeded on the saving throw. The effect only ends when the creature leaves the Gorge for more than one hour.

The Calm Emotions spell states :

You attempt to suppress strong emotions in a group of people. Each humanoid in a 20-foot-radius sphere centered on a point you choose within range must make a Charisma saving throw; a creature can choose to fail this saving throw if it wishes. If a creature fails its saving throw, choose one of the following two effects. […] Alternatively, you can make a target indifferent about creatures of your choice that it is hostile toward. This indifference ends if the target is attacked or harmed by a spell or if it witnesses any of its friends being harmed. When the spell ends, the creature becomes hostile again, unless the GM rules otherwise.

Let’s say Fred the Fighter & Clarence the Cleric both spend an hour in the Gorge while staying close together. Fred then fails his Bloody Fervor saving throw, while Clarence succeeds it, thus making Fred compelled to attack Clarence. Assuming that leaving the Gorge is not an option, could Clarence cast Calm Emotions on Fred, choosing the second effect (quoted above) to prematurely end Fred’s Bloody Fervor ?

This is within the scope of Adventurers League play, where GMs must follow the rules more (and I’m asking as the GM).

How to play the particle effect of a parent object without playing that of its child object?

In my game, when one of the enemy’s body parts is hit by a bullet, I want that body part to play a particle system effect where blood splashes out. Some of the body parts are nested inside of each other (foot is a child of lower leg, and lower leg is a child of thigh, so on…). This is unavoidable because I’m using bone animations. The problem is that if I play the particle effect of one object, it will also play the particle effect of all of its children as well. Is there a solution to this?

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private void OnTriggerEnter2D(Collider2D other) {     if (other.CompareTag("Enemy"))     {         other.GetComponent<ParticleSystem>()?.Play();     } } 

Can we cancel Vissicitude effect by cut the affected limb then regenerate it?

I have a friend that know that I’m a big fan of Tzimisce clan, and ask me how Vissicitude work. And after I tell her that it’s permanent unless you are from a better generation (or you are a Nosferatu and used Vissicitude to cancel your curse), she said that it’s super strong, then present me a situation:

Let’s say that I play a vampire with a high (aka bad) generation, and a Tzimisce with a lower (aka stronger) one use Vissicitude on me to make one of my arm useless. Can I cut my arm where it didn’t bein effected by Vissicitude, and regenerate it from this point? Or did my arm is forever useless until I find a friendly Tzimisce to cancel the effect?

My guess as a GM would be yes, at least for keeping the game fun, but I didn’t find if RAW it’s true, or not. So here I am to know, and answer my friend’s question:

“Can we cancel Vissicitude effect by cut the affected limb then regenerate it?”