I like the idea behind the brutal events. I think they might have some balancing and rules issues.
Brutal Ritual
Event - Brutal - $5
All other players gain a Curse. If they do, they reveal their hand, and trash a card from their hand that you choose. Each player who did gain +1VP per $1 it cost.
Cool, I get to Cutpurse you, then turn the Copper into a Curse. Or I can sabotage your deck but give you a non-trivial amount of VP in compensation. I guess if I'm happy to swindle your 5'ers into Duchies, I might be happy turning them into 4-point duchies as well, given that I get to also Pillage your hand.
I think "if they do" should be "Each player who does reveals their hand [...]", unless of course it's intentional that I deal out the last n-1 curses to each player except the one on my right, without trashing anything.
Brutal Advance
Event - Brutal - $1
All other players reveal their hand, and trash an Action card from their hand that you choose. Each player who did gains an Action card costing up to $6 that you choose
For $1 I get to turn your King's Court into a Scout? That's
crazy I guess we're playing Big Money this game.
Brutal Delve
Event - Brutal - $3
+Buy
All other players gain a Silver
Seems quite strong with Bandit Fort and maybe Wall, but rather meh otherwise.
Brutal Banquet
Event - Brutal - $4
All other players gain two Coppers and a Non-Victory card costing up to $5 that you choose.
Mountebank costs $5 to buy and gives +$2 when played. This costs $4 and a buy per "play", can't be blocked and gives out an extra Copper. And Mountebank is already very strong. This seems br0ken.
Brutal Wedding
Event - Brutal - $5
All other players gain a Gold, +1VP, and take 3 debt
Could debt-pinning someone work?
I could see buying this when I make an otherwise-PPR play. Once again, nice with Bandit Fort.
Outside of a few niche situations, meh, I'm not sure I would buy this.
Brutal Dominate
Event - Brutal - $15
Gain a Province. If you do, +9VP. Perform the instructions of a random Brutal effect (including those not in the kingdom).
You should probably specify that the random effect is chosen with a uniform distribution.
Brutal Torturer
Action - Attack - $6
+3 Cards
All other players choose a Brutal Event whose instructions you perform (Brutal events not in in the kingdom can be chosen).
Do they choose one each? In a 4p game, each opponent gains 3 silver (for example)? Do they vote for a single event?!?
Anyways, free silver doesn't seem like a too oppressive "attack". I think I prefer Smithy.
Brutal Summon
Event - Brutal - $6
All other players gain an Action card costing up to $4 that you choose (choose once for all players). At the start of their next turn, they play the set aside card. Until it finishes resolving, you can see all cards they can and make all decisions for them.
Brutal Summon a Steward, on your turn I call your Ratcatcher to trash one of your Provinces, then Guide your hand, use your duration Dungeon to make it hard for you to kick off, then Steward-trash two provinces. (All of this happens at the start of your turn, and I decide on your behalf which one you do next.)
Suppose Alice buys Brutal Summon on her turn and Bob buys it on his turn, then on Carol's turn both Alice and Bob decide which start-of-turn event to activate next, until either Alice's or Bob's summon has been resolved (in which case the other person unilaterally decides). Suppose Alice and Bob disagree, what happens?
If I Brutal Summon a Steward and Alice gains the last one, do I make all of Bob's decisions until the Steward he didn't gain resolves, i.e. forever? I think there should be words limiting the Posession-effect to those who gained a copy of the card. Maybe you should also copy Posession's trash-becomes-set-aside clause?
This looks like it has some rules issues left to work out.