Well Since I am rather huge person on the expertise of dragon slayer magic as many of my characters have been dragon slayers on various forums I can give my output to the ideas cast on here as well as give some ideas all together. I realize I am not staff but I am free to give my opinion as I read many of these and straight up questioned why.
Tree slayer, yeah that would be wood slayer as tree is made of wood so yeah that would be fine.
Already gave my input on the tree slayer situation.
War slayer. . .yeah I am just gonna go ahead and say that sounds straight up like War of the four horseman
Phoenix Slayer, isn't this just a fire dragon slayer as a phoenix is fire element based. . .
Peace slayer, So they don't fight?
Slayer Slayer, I really hope this was a joke because this makes zero to no sense. . .this would just translate to an assassin I believe
Dream Slayer, so then they are completely just useless in actual battle unless the user is sleeping, or freddy kruegar?
Nightmare Slayer, ^
Fairy Slayer, so a light dragon slayer or any other slayer that uses light based oriented attacks.
Astral slayer. . .slayer that eats stars, kinda useless unless in space of which no oxygen.
Blood slayer: huh. . .as cool as this sounds this is literally just a vampire.
Bone Slayer: Sooo kaguya in the sense that they can eat bones now?
I really hope you don't think of me as a jerk when i say my output here but now you wanted Slayer Ideas? Well I have a couple.
Magnet Slayer: now hold on I just got done grilling about how the other ones didn't make sense how does this one? Well let me explain Magnet slayers could only slightly change the polarity of an attack like say someone was going to kick them, they could slightly change the polarity of the position of the foot and move it slightly to the left and have it miss them, so long as the other person isn't stronger than the attack. Okay. . .well how would they fuel what would they eat, well see that would be interesting to see but honestly he direct approach is anything that conducts a magnetic pole of north or south, this meaning a magnet. Nails, poles, ect. Physical actual metalic objects that conduct a north and south. Only downside is any metal made by idk say the Iron Dragon Slayer, can't be consumed because it was created and has no magnetic pole.
Ice Slayer: {not sure you have one didn't feel like checking} This is a fairly easy one to comprehend it is much like an AOE {area of effect} and obviously the consumption would be any source of ice. They can transform water into ice. It's essentially Ice Make but without having to yell Ice Make and only forming weapons you actually get the roar, area of effect, and the consumption to go with it.
Well now then after I said all this you may have some opinions as I said I meant no harm in any way just thought I put my opinions out there.
um What? Chaos Slayer eats what now? How would one go about telling that this was going on and second an attack that causes things to decay. . .yeah there is so many reasons as to how that is OP and why it wasn't in the anime. . .oh wait it was Ankhseram Black MagicChaos Slayer! Eats Entropy, attacks cause things to decay.
Tree Slayer! Eat trees, give things splinters.
Tree slayer, yeah that would be wood slayer as tree is made of wood so yeah that would be fine.
TREE SLAYER
PHOENIX SLAYER
WAR SLAYER
PEACE SLAYER
SLAYER SLAYER
DREAM SLAYER
NIGHTMARE SLAYER
FAIRY SLAYER
Already gave my input on the tree slayer situation.
War slayer. . .yeah I am just gonna go ahead and say that sounds straight up like War of the four horseman
Phoenix Slayer, isn't this just a fire dragon slayer as a phoenix is fire element based. . .
Peace slayer, So they don't fight?
Slayer Slayer, I really hope this was a joke because this makes zero to no sense. . .this would just translate to an assassin I believe
Dream Slayer, so then they are completely just useless in actual battle unless the user is sleeping, or freddy kruegar?
Nightmare Slayer, ^
Fairy Slayer, so a light dragon slayer or any other slayer that uses light based oriented attacks.
Yeah. . .sound slayer literally should not be allowed as sound moves past the speed of light barrier and goes on infinitely just thought I point that outCan't believe no one though of Sound Slayer. The eating would have to be nerfed, but it could work. Perhaps an Astral or Blood slayer. Bone slayers might be cool tool.
Astral slayer. . .slayer that eats stars, kinda useless unless in space of which no oxygen.
Blood slayer: huh. . .as cool as this sounds this is literally just a vampire.
Bone Slayer: Sooo kaguya in the sense that they can eat bones now?
Um. . .just like to point out that every character on here that wishes to kill a human or any user on this site is technically a human slayer. . .just not every one of them is a cannibalHuman Slayer.
This is comical. . .sandwich slayer
Not true at all let me try and explain, Though fire and earth make a combined element of itself to make Magma it does not mean that it is over powered in fact both elements being combined together could be weak alone but when combined together they make for the strength of one basic element. For example on the site I am currently on we have a Lava DS, though they have to train for the second element they get the first free be it fire or earth, then they train for the second which would be dependent on which on they chose for free. The condition was that both basic elements would be one rank weaker of which when both elements were combined it would equal to the strength of a basic element. Now then you might argue, well isn't that just fire then to which I say no. Lava DS can only eat the surrounding floor and mostly generates through an earth like style with fire forming off of it. But this is just my input.That's cool... but that's just Fire/Earth slayer. And having a slayer that can eat more than one element is kinda.... Overpowered.
I really hope you don't think of me as a jerk when i say my output here but now you wanted Slayer Ideas? Well I have a couple.
Magnet Slayer: now hold on I just got done grilling about how the other ones didn't make sense how does this one? Well let me explain Magnet slayers could only slightly change the polarity of an attack like say someone was going to kick them, they could slightly change the polarity of the position of the foot and move it slightly to the left and have it miss them, so long as the other person isn't stronger than the attack. Okay. . .well how would they fuel what would they eat, well see that would be interesting to see but honestly he direct approach is anything that conducts a magnetic pole of north or south, this meaning a magnet. Nails, poles, ect. Physical actual metalic objects that conduct a north and south. Only downside is any metal made by idk say the Iron Dragon Slayer, can't be consumed because it was created and has no magnetic pole.
Ice Slayer: {not sure you have one didn't feel like checking} This is a fairly easy one to comprehend it is much like an AOE {area of effect} and obviously the consumption would be any source of ice. They can transform water into ice. It's essentially Ice Make but without having to yell Ice Make and only forming weapons you actually get the roar, area of effect, and the consumption to go with it.
Well now then after I said all this you may have some opinions as I said I meant no harm in any way just thought I put my opinions out there.