Toolbelt:
Regenerating Mist – This provides a little bit of regeneration and creates an water field. However, it’s a small window to combo and is difficult to finish yourself.
Healing Mist – This provides even more regeneration than Regenerating Mist and can even be used when you get disabled.
Big Ol’ Bomb – An area of denial skill and a blast finisher. This is lots of fun to play with. If you see an enemy Mesmer portal in WvW, run up to it and place the Big Ol’Bomb. Then watch the enemy fly as they portal through.
Grenade Barrage – This throws 8 grenades with the Grenadier trait, giving you an insane amount of burst damage.
Traits:
Explosives: 30 Points
III: Forceful Explosives – A must for Bomb Kit as it increases the blast radius.
VII: Explosive Powder – Bombs and grenades get an extra 10% damage.
XI: Grenadier – Increases the grenade range to 1500 and throws an extra grenade.
Evasive Powder Keg – This creates a bomb when you dodge. So try to dodge into your enemies to place the bomb closer, unless you’re kitting them.
Steel-Packed Powder – Every time you hit your enemies with a bomb or grenade you cause vulnerability. Each grenade counts as 1 stack, and since you throw 3, you can stack 20 to 25 vulnerability really fast and keep it on with the basic attack.
Alchemy: 20 Points
VI: Protection Injection – You gain 3 seconds of protection when disabled (5 second cool down). This is handy for melee classes that want to burst you. Usually they start off by disabling you, and then burst you. The 33% less damage helps a lot.
IX: Backpack Regenerator – 125 HP every tick when holding a kit. It’s not a lot of health by itself, but when stacked with Super Elixir, food, and regeneration boons you can out heal a lot of damage.
Tools: 20 Points
IV: Kit Refinement – Free Super Elixir when switching to Elixir gun. This is your main source for fast condition removal.
VI: Speedy Kits – Perma-Swiftness! You’ll always be moving 33% faster. Keep switching between kits every 5 seconds.
Equipment:
Cleric (Power/Toughness/Healing) armor with Engineer Runes. The Engineer runes gives more toughness and 5% more damage when using a kit. Don’t forget to put an Engineer Rune on the water breather, because your helmet unequips when underwater. For the back piece, rifle, and water breather, use Soldier gear (Power/Toughness/Vitality) for a bit more power and vitality. For the trinkets I also use Clerics with sapphire jewels. You should have roughly 800 healing power in PvP and PvE.
For the rifle, I use Sigil of Superior Force for 5% more rifle damage. You don’t need to equip a spear gun for underwater, just use the Grenade Kit (trust me).
Food and Sharpening Stones:
If you don’t use food and maintenance oils or sharpening stones in WvW, you’re at a disadvantage. Use Mango Pies for +70 Vitality and 85 HP regeneration per tick, and use either Hardened Sharpening Stones or Superior Sharpening Stones for more power (which ever you can afford).
And that’s the “Beast” build. A shout out to commander Silborn on Isle of Janthir because he’s the one who coined the nickname. I hope it gives you some insight on the engineer class and how it can be a powerful force on the battlefield.