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Unlike when playing as a Rifleman, when playing a Grenadier, your bread and butter ability will be Firebomb, not Gun Blast. Also, you will want to make significantly more use of Acid Bomb, as it does damage and debuffs your enemies to your main damage type, corporeal. Try and mix Fragmentation Grenade and Sticky Bomb in with Acid Bomb when attacking large groups for huge amounts of damage. This is especially useful in RvR scenarios with chokepoints, like
Mourkain Temple. Also, once you get it, make good use of Napalm Grenade, especially when defending keeps. Strafing run is useful, but not essential, and Flash Bang and Concussion Grenade are situational - use them sparingly, and only when needed. You get most of your useful abilities earlier than Rifleman and Tinkerer, so take advantage of that and get used to using them.