Single-target focus offers little against mech bosses with massive HP pools, and his kit has no DoT or sustained scaling to chip them down.

Known bug: Fenrus deals less damage in Technodome than in arena under identical conditions. Executioner's chain-kill and last-enemy bonus are dead weight in a one-boss fight. 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 Fire hits a target for 850% plus 500% to the enemy behind it, and Executioner chain-kills can snowball fights by reusing the skill on a fresh target after each Killing Blow.

Stealth +50 from Killing Machine helps survive the opening rounds. Praying Protection grants a 100% Max HP shield to all allies on his first Killing Blow, making the whole team deceptively tanky. Silence immunity from Killing Machine keeps Fenrus's skill rotation online in Mantis mirror matchups.

Stealth and burst focus provide utility, but single-target output 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. Silence immunity from Killing Machine keeps his rotation safe from a common PvP lockout, and Focus Fire can Stun both targets when Fenrus is healthier than the victim. Viable as a secondary finisher but not a priority build.

Community S-tier cleaner. Focus Fire + Executioner chain clears minion waves efficiently — 850% to a front target plus 500% to the enemy behind, and each Killing Blow reuses the skill on a new target. Healthier-than-target Stun locks down both victims.

Praying Protection's 100% Max HP team-wide shield on his first kill provides boss-phase survivability. Silence immunity from Killing Machine keeps his rotation running through caster bosses, and the last-enemy bonus (100% Max HP heal + 1500% on the next skill) caps off the clear. 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 via repeated skill reuse.

Focus Fire concentrates burst on a row pair (850% + 500%). Silence immunity from Killing Machine keeps his skill rotation reliable against caster-heavy sewer stages. Praying Protection's 100% Max HP team shield ensures the squad 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.