Silent Sister Abilities: War Cry (Call to Arms), To the Death (Engarde), Flashing Steel (Defensive Spin), War Horn (Break Their Spirit)
Passives: Unforgiving Chain, Bulwark, Bear Mauls the Wolves, Salty Sea Dog, Cutting Words, Untouchable Defense, Grisly Mutilation, Terrifying Fury, Turn the Blade, Turn the Bolt, Deep Reserves
Core Play: Taunt enemies with War Cry to gain guard. Use Flashing Steel when your guard is low around a mob. To the Death big targets and call it out to teammates for more guard and easy melt. Use War Horn around a group to create panic and fear for melt on enemies, especially when near an armored enemy.
Reaver Abilities: Devour (Consume), Rampage, Dragon Rage (Ravage), Mighty Blow (No Upgrade), Ring of Pain (no upgrade and not mapped)
Passives: Fervor, Warrior's Resolve, Blood Frenzy, Blood Bath, Scenting Blood, Terrifying Fury, Deathblow, Coup de Grace, It'll Cost You, Adamant, Resilience, Deep Reserves, Crippling Blows, Clear a Path, Bear Mauls the Wolves
Core Play: Smash everything. Use Dragon Rage for Damage. Use Devour for Health. Use Rampage in big fights to get more health and deal more damage. Use Mighty Blow for knockdowns and detonation. All of your passives feed into dealing tons of damage, taking advantage of fear, and creating fear.
Assassin Abilities: Twin Fangs (Ripping Fangs), Deathblow (Trill of Victory), Stealth (Lost in the Shadows), Poisoned Weapons (Infected Wounds)
Passives: First Blood, Cull the Herd, Mercy Killing, Cheap Shot, Looked Like It Hurt, Unforgiving Chain, Throatcutter, Bloodied Prey, Sneak Attack, Ambush, Easy to Miss, Dance of Death, Explosive Toxin, Bloodthirst
Core Play: Stealth to the back of the fight, and then activate poisoned weapons, follow with twin fangs into the back of an enemy to poison and knock them down. The enemy will explode into a toxic cloud and you can eliminate a group of archers and ranged enemies quickly. Then you can come back to the mob fight and use deathblow to get tons of crits on fear and panicked targets for no cooldown and stamina buffs.
Necromancer Abilities : Horror (Despair), Mind Blast (Fortifying Blast), Walking Bomb (Virulent), Fade Step (Frost Step)
Passives: Blinding Terror, Conductive Current, Virulence, Pyromancer, Hastened Demise, Overwhelming Force, Simulcrum, Death Siphon, Power of the Dead, Gathering Storm, Clean Burn, Tricks of the Trade, Winter Stillness
Core Play: Use Horror in a large group of people to create fear. Use Mind Blast when surrounded to gain barrier and detonate other effects. Walking Bomb will spread around a battlefield creating death. Frost Step will freeze targets for more detonations. All of your passives make you more powerful against panicked targets, spread panic around the battlefield, make others stronger, and help with cooldowns and mana.
This is a good build to let someone else experiment with a character to see what they're good at.