Your dream is rich with intense imagery and complex narratives, which can often reflect deep emotional and psychological themes in your waking life. Here's an interpretation of some key elements:

1. Ambush and Violence: The initial scene of an ambush in a castle may symbolize feelings of being attacked or overwhelmed in a situation in your life. The violence and chaos could reflect inner turmoil, perhaps stemming from conflict or unresolved issues that you are currently facing.
2. Switching Sides: Your decision to escape and change sides suggests a desire for freedom or a need to distance yourself from a situation that feels dangerous or constraining. It may indicate a struggle with loyalty or moral dilemmas in your relationships or responsibilities.
3. Spectating Executions: Witnessing the hanging and shootings could represent feelings of helplessness or fear regarding the fate of others. It might also reflect a sense of guilt or anxiety about your role in a situation—are you an observer when you wish to be an active participant or vice versa?
4. The Escape and Captivity: The character you identified with moves from being a captive to being needed for defense. This transition may signify your own journey from feeling trapped or powerless to becoming a key player in your own life. However, being kept captive by the one who helped you escape could imply that even when presented with opportunities, there can still be elements of control or manipulation at play.
5. The Fear of Invasion and the Jedi: The attack and the unexpected arrival of Jedi may symbolize a clash between good and evil, or perhaps a struggle between your aspirations and external challenges. Jedi often represent wisdom and strength, suggesting you might be seeking guidance or a powerful ally in your own life.
6. Luminescent Plants: The glowing plants disappearing could symbolize opportunities or feelings that are fading away. This could be a warning to pay attention to aspects of your life that may be overlooked or neglected.

Overall, your dream seems to reflect themes of conflict, transformation, and the quest for agency amidst chaos. It may be beneficial to explore any current challenges you face and consider how you can reclaim your power or find support. Think about what changes you might need to make to move from a state of conflict to one of resolution and empowerment.