Maybe a crimson blade

[prime sundial]

if the player is max and a slayer then maybe he/she should be able to activate a red crimson blade when they’re low so they can do more damage

[young flare]

more or less same concept as a slayer mark, so no.

[prime sundial]

is there a slayer mark in the game?

[dreamy temple]

no

and there wont be (thank god)

[fiery canopy]

in rpg 3 game i think it will be only cosmetic or it won't be added

[near cloud]

No

[lofty scarab]

Yes

Do this

[near cloud]

No

Adding an advantage for no reason

Imagine if a demon is about to kill a slayer or a slayer is about to kill another slayer in a rank event lets say