How does Royal Entourage's ability to exhaust enemy legends interact with different legendary units (Daughter of the Void, The Boss, Blind Monk, and Lux)?

Question

Accepted Answer

I can't give card-specific outcomes for Daughter of the Void, The Boss, Blind Monk, or Lux because their card texts are not provided. Based on the Core Rules and the text of Royal Entourage ("When you play me, ready or exhaust a legend."), the ability will put a triggered effect on the chain when you play Royal Entourage; when that effect is finalized you choose a legend and choose to either ready it or exhaust it. The following ruling explains the general resolution rules and how common interactions would be handled; to resolve exact outcomes for each named legend I need each legend's full text.

When you play Royal Entourage, its ability triggers and becomes a chain item per the triggered-ability structure rules [FAQ:unleashed#1]. During finalization you choose a legend to be affected and choose whether to ready it or exhaust it. If you choose to exhaust a legend that is already Exhausted, nothing additional happens [414.1.b] [414.1.c]. If the chosen legend is removed, moved, or otherwise becomes an illegal target before the ability resolves, the instruction to ready/exhaust it may be partially or wholly unexecutable; follow the partial-resolution rules (execute what can be done, ignore what cannot) [359.3.e.11] [359.3.e.12]. If any replacement effects would modify the event of that unit being exhausted or readied, those replacement effects apply and inherit modifications (for example, if a replacement says “when you would exhaust, do X instead,” that modification applies to the exhaustion event) [375]. Because I do not have the card texts for Daughter of the Void, The Boss, Blind Monk, or Lux, I cannot say whether any of those legends have abilities that change whether they can be exhausted, or have triggered/replace effects that change the outcome; provide their exact texts for a definitive ruling.

You play Royal Entourage. Its "When you play me" ability triggers and becomes a triggered ability to be finalized and placed on the chain [FAQ:unleashed#1]. During finalization you (the controller) choose the legend to be affected and choose whether to ready it or exhaust it. If the ability's templating in the full card text restricts "legend" to "friendly legend" that restriction must be followed (I don't have the full templating here). The triggered ability becomes a chain item. Players may respond to it on the chain as normal. When the chain item resolves, attempt to perform the chosen instruction: ready that legend or exhaust that legend. If the legend chosen is already Exhausted and you chose to exhaust it, nothing additional happens [414.1.b] [414.1.c]. If the legend is no longer present or otherwise illegal, follow the partial-resolution rules and treat unavailable checks as null [359.3.e.11] [359.3.e.12]. If any replacement effects would modify the event of the unit being exhausted or readied, those replacement effects apply and inherit modifications according to replacement-effect rules [375].

If the chosen legend is already Exhausted and you chose the "exhaust" option, the ability resolves but does nothing extra for that action (per [414.1.b] and [414.1.c]). If the chosen legend has a replacement effect that changes what happens when it would be exhausted (for example, "If I would be exhausted, do X instead"), that replacement effect is applied to the exhaustion event and its modifications are inherited [375]. If the chosen legend is moved, killed, or otherwise removed before resolution such that it is no longer a legal object to be readied/exhausted, the instruction cannot be carried out for that object; execute any other instructions if present, or otherwise the chain item does nothing for that part [359.3.e.11] [359.3.e.12]. If Royal Entourage's ability in its full templating restricts "a legend" to "a friendly legend", then you cannot choose an opponent's legend. I cannot determine this without the full printed templating of Royal Entourage. If any of the named legends have text that explicitly prevents being exhausted or changes how exhaustion interacts with them, that card text would override the general application described here; I do not know if they have such text without their full card texts.

Base interaction
When you play Royal Entourage, the phrase "When you play me, ready or exhaust a legend." is a triggered ability that triggers when the card is played. Per the triggered-ability structure, that trigger is finalized (you make its required choices and it becomes a chain item) and then placed on the chain [FAQ:unleashed#1]. As part of finalization you must choose which legend will be affected and you must choose whether to ready it or exhaust it (the ability text contains no "you may" so it is not optional to place the ability on the chain; it will be placed and you must make the choices required by the ability if legal) [FAQ:unleashed#1].

Resolving the ability
When that chain item resolves, the game attempts to perform the instruction you chose (ready or exhaust the chosen legend). Exhausting and Readying are board-state changes governed by the Exhaust rules. If you chose to exhaust a unit that is already Exhausted, nothing additional happens per the exhaust rules ([414.1.b] and [414.1.c]). If the chosen legend has been moved off the board or otherwise become an illegal object (so the game can no longer reference its location/state) before resolution, checks about that object's state return null and instructions that depend on that information are ignored; instructions that can be partially followed are executed as much as possible [359.3.e.12] [359.3.e.11].

Replacement effects and special text
If the legend has any replacement effects or continuous effects that change what happens when it would be exhausted or readied (for example, a replacement that says "If I would be exhausted, do X instead"), that replacement effect applies to the exhaustion event and inherits modifications to the event as described by the replacement-effect rules [375]. In other words, an effect that would replace or modify the exhaustion/readied event will be applied when the triggered ability tries to exhaust/readied that legend.

Why I can’t answer per-card outcomes here
You asked specifically about Daughter of the Void, The Boss, Blind Monk, and Lux. I do not have the printed, official rules text of those cards in the context you gave me. Whether any of those legends can be exhausted by Royal Entourage or whether special interactions occur (for example, a legend that cannot be exhausted, a legend that responds when exhausted, a legend that is immediately readied by another effect on exhaustion, or a legend that has a replacement effect changing exhaustion into another effect) depends entirely on their card text. Because the Core Rules require applying card text and replacement effects as written, I cannot state a definitive, card-specific outcome without those texts.

What I need to give a definitive, per-card ruling
Provide the full card text for each of the four legends and confirm whether Royal Entourage's printed templating contains any restriction on which legends it can target (for example, "a friendly legend" vs. "a legend"). With that I can apply the concrete rules above ([FAQ:unleashed#1], [414], [359], [375]) to produce a precise ruling for each of Daughter of the Void, The Boss, Blind Monk, and Lux.