Osgrun the Defiler — guide

In short

Osgrun the Defiler is a Legendary Dwarf Support with the Magic affinity: he strips buffs in bulk, cuts turn meters, lands Stun and pushes the team with an ally attack under Increase ATK. He shines in Arena, dungeons and hard content, while Clan Boss gives him nothing to do. Build priority is Speed first, then Accuracy, then survivability.

Strengths

• A2 Magic of Ireth is a full control package: removes buffs from all enemies, reduces their turn meter and places a 1-turn Stun, at up to a 100% chance once booked.
• A3 Death-Defying gives the team Increase ATK 50% and a small 7.5% Weaken, then attacks the target together with every ally using their default skill (ally attack).
• Passive: allies deal 20% more damage to Stunned enemies — perfect fit with his own A2.
• Aura of +28% Ally SPD in Arena is close to mandatory for an Arena lineup.
• A1 Obsidian Blade fills the whole team's turn meters by 10% and extends a random active skill cooldown on the target by 2 turns.

Weaknesses

• Almost useless in Clan Boss: no poisons, no shields, no debuff cleansing for allies.
• His control lives or dies by Accuracy — without ACC, A2 is just a buff strip.
• His own damage is negligible and his ATK base is low; he is pure support.
• The active part of his passive only fires when an ally dies, so it does nothing in fast clears.

Where to use

Arena (4.5/5) is his main stage: turn meter reduction, buff removal and Stun break enemy setups, and the SPD aura helps win the speed race. Next come Dwarf Faction Wars (5/5, where he is a star), Chimera, regular dungeons and hard content (4/5 each). Hydra and Doom Tower are middling (3.5/5), and there is no reason to bring him to Clan Boss (3/5).

Stats and gear

Priority: Speed → Accuracy → HP% / DEF% → Resistance. Rough targets: SPD 220–260 (280+ for Arena), ACC 250–350, HP 60–80k, DEF 2500+, Resistance optional. Crit Rate and Crit Damage are irrelevant here.

Sets from the list: Speed, Reflex, Relentless, Perception, Protection, Pinpoint, Feral. A solid base is Speed + Perception or Pinpoint; Relentless makes sense if you want extra turns to cycle A2 more often.

Relics: Chronocube, Harp of Kasbiel, Eternal Soulgaol.

Masteries and blessings

The tree list is tuned for a control-support: Power Reset and Skill Adept for cooldown cycling, Puppetmaster and Patient Refuge for durability and death-triggered value, plus Revival Blessing, Revival's Boon, Parting Gift, Lifedrain, Survival Speed and Bolstered Defense for overall team resilience.

Blessings: Brimstone if you want extra damage pressure, Intimidating Presence if the team needs more survivability instead.

Tombs

Book A2 Magic of Ireth first: the +10% and +15% chance upgrades push both the buff strip and the Stun to 100%, and the two -1 cooldown upgrades let you cycle that control far more often. A3 next for its two cooldown reductions on the ally attack. A1's +10%/+15% debuff chance comes last.

Verdict

A strong Arena support and a must-have for Dwarf Faction Wars, but not a universal pick — Clan Boss and parts of PvE simply have no use for him.