In line with the goal of HVDC-WISE, that is to support further development of hybrid AC/DC transmission grids by establishing new reliability and resilience (R&R) oriented planning and analysis tools and identifying HVDC-based grid architectures and technologies, this document serves as the final version of Deliverable 5.4 within Work Package 5 (WP5). The associated task in this work package, Task 5.3 from WP5, primarily focuses on the modelling, quantification, and mitigation of cascading failures using an integrated tool. The tool evaluates the impact of initiating events and identifies whether cascading failures propagate across the system or not. In the case of cascading propagation, it subsequently quantifies the extent and severity of the cascade. Based on this assessment, the tool implements an effective operational mitigation strategy, specifically controlled islanding, to prevent the spread of cascading failures throughout the system.