What is the lowest-level spell combo to give disadvantage to an enemy’s specific save, without running into follow-up concentration issues?

What I’m trying to do is debuff an enemy’s stat so that I can hit them with a “save or suck” spell like dominate monster, and be more likely to succeed.

The problem is, I’m running into concentration issues because most spells that debuff a single stat like Bestow Curse use concentration, and thus I cant use them in conjunction: The moment I cast Dominate Monster, Bestow Curse is removed.

Hex also will not work because it only impacts ability checks, and not saves.

To clarify, I am a Warlock who wants to cast powerful disabling spells only when they have a high chance of success (so typically Wisdom has to be the weakened modifier). However, I am open to answers outside of that class, as well as any spell combos that specifically function as

  1. Weakening the the ability save for the second spell without utilizing concentration, and

  2. The second spell being a powerful, one-save spell of concentration.

What spells would be the best for this kind of combo, given that only I can cast the spells?

Can concentration spells be “adjusted” while silenced?

For an example, the party is fighting Strahd, a vampire spellcaster. The party cleric casts Dawn, off center on Strahd to only affect him. Then the party wizard casts silence directly on top of Strahd, which will also affect the cleric. On Strahd’s turn, he moves out of the effected area of Dawn. When the cleric’s turn comes back around, they will attempt to move Dawn to return Strahd into the spells effected area.

The Relevant parts of Silence (from PHB p.276):

For the duration, no sound can be created within or pass through a 20-foot radius sphere centered on a point you choose within range. … Casting a spell that includes a verbal component is impossible there.

This does make it clear that as long as the cleric remains inside the effected area of silence, they cannot cast any spells with verbal components, which shouldn’t be a problem as they have already cast the spell, and are just concentrating on it.

The relevant parts of Dawn (from XGtE p. 153-154):

Components: V, S, M (a sunburst pendant worth at least 100gp)

If you’re within 60 feet of the cylinder, you can move it up to 60 feet as a bonus action on your turn.

Moving the cylinder is not “casting a spell,” however it is not specified whether or not this bonus action would require the same components as the initial casting of the spell. If doing so does not require any verbal component, then that also would mean that the cleric does not need the other components. This means if an ally of Strahd took the sunburst pendant from the cleric this would not stop them from concentrating on the spell, or from being able to move the cylinder on their turn.

Given this situation, is it possible for the cleric to move the Dawn cylinder while remaining inside the silence area?

If a spell caster loses concentration on greater invisibility, and an opponent has readied a reaction, what happens first?

As an example, both the spellcaster and the opponent (“the archer”) have 1 hp remaining, so whoever completes there action first will knock the opponent unconscious. The spellcaster casts Create Bonfire, On the archer’s space. However, The archer has readied an arrow targeting the spellcaster for “as soon as the spellcaster is visible.”

My question is, who’s action will go off first?

The relevant information on concentration can be found in the PHB (p.203):

You lose concentration when you cast another spell that requires concentration. You can’t concentrate on two spells at once.

and XGtE (p.5):

As soon as you start casting a spell or using a special ability that requires concentration, your concentration on another effect ends instantly.

Readied actions can be seen in the PHB (p.193):

When the trigger occurs, you can either take your reaction right after the trigger finishes or ignore the trigger. Remember that you can take only one reaction per round.

From this, it seems unclear who will complete there action first. What counts as the archer’s trigger finishing? does it finish when the spellcaster finishes casting their spell, as this action is what began the trigger? Or does the archer get to fire their arrow as soon as the spellcaster is visible, as they “finish” being invisible as soon as they begin casting the second spell?

Can I break concentration with Haste, before it ends, by casting another concentration spell? [duplicate]

Example:

Turn 1: Cast haste. Do things.

Turn 2: Cast invisibility (end haste). Be invisible. No movement, no actions.

Turn 3: Be invisible. No movement, no actions. (Resolve haste)


The section on “Concentration” states:

[…] You lose Concentration on a spell if you cast another spell that requires Concentration. You can’t concentrate on two Spells at once. […]

The haste spell states:

Casting Time: 1 action […]

Duration: Up to 1 minute […]

When the spell ends, the target can’t move or take actions until after its next turn, as a wave of lethargy sweeps over it.

The invisibility spell states:

Casting Time: 1 action […]

Duration: Up to 1 hour […]

The spell ends for a target that attacks or casts a spell. […]

Can you maintain concentration on a spell from another plane?

Here are two scenarios:

  1. A powerful enemy caster is concentrating on some high-level offensive spell (Incendiary Cloud, Earthquake, etc.)–one PC casts Banishment and the caster fails the save. Can the enemy caster maintain the spell from the demi-plane?
  2. A PC casts Expeditious Retreat and Blink on themselves: when transported to the Ethereal Plane, can they maintain the effect?

Currently, I’m leaning towards ‘no’ in the first case and ‘yes’ in the second, based on this last line from Blink:

You can only affect and be affected by other creatures on the Ethereal Plane.

In other words, as long as you’re in the same plane as the effect you want to maintain, then yes.

Does casting a spell with a longer casting time end a spell that you were previously maintaining concentration on?

From D&D Player’s Basic Rules v0.3, p79:

Longer Casting Times

Certain spells (including spells cast as rituals) require more time to cast: minutes or even hours. When you cast a spell with a casting time longer than a single action or reaction, you must spend your action each turn casting the spell, and you must maintain your concentration while you do so (see “Concentration” below). If your concentration is broken, the spell fails, but you don’t expend a spell slot. If you want to try casting the spell again, you must start over.

Does casting a spell with a longer casting time force the caster to end an active Concentration-duration spell?

Concentration on a spell while casting a spell with a longer casting time [closed]

Is Casting a spell with a casting time longer than 1 action considered „concentrating“ on it, for the purpose of keeping concentration on a different spell already cast?

Ex.: flaming Sphere on the field, next round starting to cast conjure minor elemental (1min). Does the flaming sphere puff at the start of the minute or at the end when the spell slot is spend and the spells effect takes place?

Is summoning an air elemental with the Censer of Controlling Air Elementals still a concentration spell?

Items that let you cast a spell through them (e.g. wands , staves, etc) use specific wording such as:

While holding it, you can use an action to expend 1 or more of its charges to cast the xxxxxx spell…

The Censer of Controlling Air Elementals states

[…] you can use an action to speak the censer’s command word and summon an air elemental, as if you had cast the conjure elemental spell.

Since it sounds like the air elemental is conjured by the item after uttering a command in 1 action and not by the user casting a spell with a 1 minute casting time, does it still count as a concentration spell for the user?

Does breaking concentration of the slow spell break its effects immediately?

On your turn you break the concentration of an (enemy) slow spell (5e) with your weapon attack. When exactly the spell stops effecting you? At the same moment the enemy spellcaster loses the concentration or the next turn? By other words, do you get back your extra attacks, bonus action, second halve of your movement … right away on the same turn?