The Bladedancer is one of my most played masteries and poison is among my favorite archetypes in Last Epoch. This build gets to combine both to devastating effect as it melts bosses with ease.
This is a glass cannon boss killer with a focus on dealing as much damage as possible to kill bosses before needing to deal with the majority of their mechanics. It is primarily focused on killing Tier 4 Julra in the Temporal Sanctum, but can also be used for Soulfire Bastion. It can be used for Twilight Arbor, but is less suited to farming there due to the time-gated nature of the boss where its lack of defense and inability to brute force past the mechanics requires exceptionally good play or significant alteration to the build to survive.
The core setup is relatively SSF friendly, requiring only , but the build really takes off and scales to the moon with access to , allowing us to scale Poison Effect via Critical Multiplier.
In Monolith echoes, the build's damage allows it to clear smoothly in most layouts while and high uptime allow it to move quickly to objectives. The core setup is not focused on pushing to high corruption, but I've found it able to farm around the 300 range without issue, letting it easily farm its blessings, various boss uniques, or targeted unique nodes. In general, I would consider its clear speed mediocre due to the single target focus of the build.
Defensively, the build attempts to cover the core defenses of Health, Resistances, Endurance %, and Critical Strike Avoidance. Alongside these, the build gets a significant amount of Glancing Blow chance via stacks and the passive skill tree. The build can also make use of to automatically dodge certain large attacks, applied via and . You also have access to a short invulnerability via 's and a short but significant dodge buff via . These defenses are typically sufficient for the level of content the build is aimed at but will require careful play at times to manually avoid large telegraphed hits from enemies and a failure to avoid such hits is often going to mean death.
There is some flexibility to build's skills, allowing you to pick up the utility that suits the situation. For example, getting for its additional armor buff via or for its additional invulnerability window and higher instant kill threshold . Oftentimes, this involves dropping for the needed skill.