As well as generic engravings for any character, every class comes with the option of having two "class bonuses" engravings that are unique to their class Lost Ark Boosting. Effectively, they allow you to pick a subclass for them to specialise in. The engravings for the Deathblade class include Surge and Remaining Energy These come with the following bonus features:

Remaining Energy adds 2 seconds for Deathblade Arts triggered by a Death Orb, as with this benefit, the meter isn't depleted after two seconds of deploying. Furthermore, performing one of the Deathblade Arts burst attack grants another 30 seconds of buffs to speed of movement, attack power, and speed.

Surge provides a stack of Surge Enhancement every when your Deathblade lands a hit with every attack (except for default attacks and Awakening skills) when Deathblade Arts are in play. The maximum number of stacks is 20 and each stack increases your outgoing damage by 7.5 percent (and when you reach higher levels, the attack power can increase by as much as 1 percent per stack too). When Deathblade Arts reaches the end of its lifespan every Surge Enhancement replenishes it with Death Orb by the amount of 5%.

Both are viable options However, the apparent difficulty of Surge in conjunction with the incredible PvE rewards offered in Remaining Energy, mean that the majority of players opt for the former. However, Surge is easier to use than it is to explain Buy Lost Ark Gold, so if are interested in Surge's capabilities do not be deterred from including it in your endgame build instead -it's the best option to do the most amount of damage the Deathblade is capable of in just one strike once you've mastered it.