Poison damage is negligible against mech bosses with massive HP pools. Focus Mark has no real value in single-boss fights since all attacks already target the same enemy.

Known bug: Fenrus deals less damage in Technodome than in arena under identical conditions. Outclassed by Spekkio and dedicated mech carries. Only relevant if your Mantis roster is deeply invested and you need a 6th slot.

Strong Mantis faction finisher for club smash. Focus Mark directs all ally attacks to a single target, coordinating team fire for quick eliminations. Executioner chain-kills can snowball fights.

Stealth +50 from Killing Machine helps survive the opening rounds. Praying Protection grants a 100% max HP shield on first Killing Blow, making Fenrus deceptively tanky. Poison immunity from Killing Machine synergizes with Mantis mirror matchups.

Stealth and Focus Mark provide utility, but single-target focus limits overall impact in PvP's multi-threat environment. Executioner chain is powerful when it triggers — instant skill reuse on Killing Blow.

Outclassed by dedicated PvP picks like Nyx and Raja in most compositions. Focus Mark on revived enemies (100% trigger + 40% stat reduction) gives niche anti-revive utility. Viable as a secondary finisher but not a priority build.

Community S-tier cleaner. Focus Fire + Executioner chain clears minion waves efficiently — 850% single-target + 400% Poison burst kills minions on turn 1. Focus Mark spreads 80% Poison to remaining enemies on kill.

Praying Protection's 100% max HP shield on first kill provides boss-phase survivability. Focus Mark on revived enemies applies 40% Armor/Block/DR reduction, preventing tanky minions from stalling. Pairs well with Hana for a clean + support Mantis hard-mode core.

Valuable Mantis finisher for sewer content. Executioner chain-kill mechanic excels in multi-round sewer fights where picking off weakened enemies can cascade into full-team wipes.

Focus Mark coordinates team damage onto priority targets. Poison immunity from Killing Machine provides resilience against Poison-heavy sewer stages. Praying Protection shield ensures Fenrus survives at least one lethal hit per fight.

Solid campaign finisher with chain-kill mechanic that accelerates wave clearing. Executioner's instant skill reuse on Killing Blow lets Fenrus clean up entire waves when enemies are low.

Praying Protection's 100% max HP shield provides multi-wave survivability. Falls off in late campaign stages (1500+) when enemies become too tanky to one-shot, breaking the Executioner chain. Best paired with AoE carries who soften targets first.