Demolitions Expert is a character enhancement card in Back 4 Blood. It is a Offense Type Card with Brawn 
Affinity. The card can be used in both PvE and PvP game modes.
Card Ability
+50% Accessory Damage
-15% Ammo Capacity
Demolitions Expert is one of the few cards in the Back 4 Blood that increase accessory damage. It doesn’t give the highest amount of accessory damage but its penalty is relatively minor with the player having less ammo capacity.
Card Playstyle
Players who use Demolitions Expert will most likely be running Offensive Accessory builds where they do maximum damage with Grenades or Molotov Cocktails.
While players with Offensive Accessory cards do tremendous amounts of damage, they’ll spend most of their time using their guns to kill Ridden. Using your Offensive Items will be reserved for tougher Mutations, Boss Ridden, and quickly clearing out areas.
Boss Specialist
With Demolitions Expert and other Offensive Accessory cards, your grenades will do thousands of damage and take out large chunks of Boss Ridden health. At the Recruit level, this can even one-shot some bosses.
Molotov Specialist
Molotov Cocktails can empty out entire areas and prevent Ridden from coming through with its increased damage.
Offensive Accessory Specialist Cleaners
Hoffman will be the most common Cleaner using Demolitions Expert and other Offensive Accessory cards because of his ability to hold 1 more Offensive Item than everyone else.
Karlee is another candidate, although not as much as Hoffman, because of her ability to spot Mutations early and not having any other clearly defined role.
Card Synergies
These types of cards further help Demolitions Expert cardholders increase Offensive Accessory damage, hold more Offensive Items, or activate abilities when throwing an Offensive Item.
Fire in the Hole! – Lets the player heal 20 Temporary Health and move faster for 5 seconds. It lets the player throw and run away when in a pinch.
Grenade Training – 25% more Accessory Damage to stack on top of Demolitions Expert.
Improvised Explosives – Further increases Accessory Damage by 75% at the cost of 25% Swap Speed. Combining all 3 cards will result in 150% more Accessory Damage to devasting numbers.
Bomb Squad – High Explosive Damage increase at 100% that affects grenades and pipe bombs. Great for explosive builds.
Double Grenade Pouch – Adds 2 more offensive items at the cost of 10% damage. It will definitely help against bosses that have extra-large amounts of health.