The builds I remember to have few buttons and be tanky:
[1.1.9.3] The Guardian of Erulan - Ranged Cadence Gun/Shield Tactician [SR 100] [All Celestials]
[1.1.9.0] The Silver Crossbow - 2H ranged pierce Purifier SR 90/CR+
To check for yourself:
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Warlords: Warlord Builds - Grim Dawn Builds
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Death Knights: Death Knight Builds - Grim Dawn Builds