Illrigger Questions with other mechanics

Please help....

Character is a 8th level Illrigger Architect of Ruin with Charisma 18 (+4)

Has Vengeful Blade:  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 radiates a dark aura of energy until the start of your next turn. If the target makes an attack or casts a spell before then, the target takes 1d8 necrotic damage and the spell ends.

Magic Initiate Druid for the Shillelagh:  A Club or Quarterstaff you are holding is imbued with nature’s power. For the duration, you can use your spellcasting ability instead of Strength for the attack and damage rolls of melee attacks using that weapon, and the weapon’s damage die becomes a d8. If the attack deals damage, it can be Force damage or the weapon’s normal damage type (your choice).

Wields a Flame-tongue Quarter Staff.

Can somebody smarter than me break this down by Action and Bonus Action per turn?

What would the attack dice look like for all of this?

What would the damage dice look like for all of this?

How does it all blend together?

Wow thanks so much for responding so fast.  It is official, you are my new go to for rules clarification.

Ok so where and when does the Vengeful Blade fit into the mix?  Does it only trigger if the target (after being hit) then later decides to attack or cast a spell, then it takes an additional 1d8 Necrotic damage?

Speaking of weird things in Illrigger, I have a question. What's the radius of Mote of Hell? 30ft or 15ft? The text says 15ft and also 30ft, but the Range/Area sections says only 30.
My instinct tells me that it's 15 and the 30 is a mistake (maybe they thought it was the diameter to input there), but I'm wondering what the others think.