is there a best tactic for demon princes?

[Pseudo Euphoria]

can someone kindly offer some advice and or help a brother out?

[Kikbow]

would be a good strat to level up 25 times

[SilentKhaos]

not die

[YourPeter]

https://www.youtube.com/watch?v=8AJkvq3Xvyw
I tried this guide and it worked well for me

[Flying Lemming Soup]

For me, the only real 'strategy' is to focus whichever demon was currently on fire, since the demon that's not on fire is less aggressive and tends to only fire long-range attacks that give you plenty of warning. Also, kill the Demon in Pain last, since that makes the Demon Prince fire lasers (I think, I might have that backwards) which I find easier to dodge. I've HEARD, though I haven't confirmed this, that the lasers can be dodged by performing the 'stretch out' gesture. I'll have to try that sometime...

Apart from that, it's just a matter of learning the moveset, like any other boss.

[Rick25]

Dont get hit
When you play bad, dont...

Alright, most of the time i use a normal shield and focus first on the more aggresive since its just a matter of avoiding the toxic of the other one. Also buy stuff to cure toxic.

Estus ring is very useful for this fight. Other that that, you gotta learn the moveset, is not very good to always keep lock on 1 target since you cannot see what the other will do try to attack on free camera.

[Crucerne]

For low SL and weapon upgrade, I use a blood infused Bandit's Knife. They are weak to bleed weapons. Else, you can also try Black Knight weapons.

[Alariel]

With my low level chars I use the blood infused Bandit's Knife too.
I summon both NPCs and tell them, their task is to kill the Demon in Pain together.
After the drop down the Demon from Below will focus on me, I roll back, back, back, to lure him away and seperate the 2 demons.
The NPCs will come a few seconds later, and with some luck they both will land near the Demon in Pain and fight him. In case one NPC follows me to the Below, I need to run to the other demon, to be able to kill the Demon in Pain first.
If we do well, both NPCs will survive the first stage. ( on any ng+++++)
In second stage Gael will die fast, but Lapp should stay alive long time and tank a lot.
My most favorite strategy is to cast Dorhy's Gnawing in second stage. Without the faith for it, I use the Bandit's Knife too.
That all is for low level chars, they can't wield Black Knight weapons. But the Bleed method works for high level chars too.

And before every difficult boss fight, I cast one Tears of Denial. Can cast it at the bonefire, so long as I have 10 faith and use the right rings. Then sit at bonfire and unequip the spell. = one free death.

[Gearwar]

Its been a while but depending of which demon you killed first ( I THINK!?!) the "special" of the demon prince changes. One is a barrage of meteors which is very hard to dodge and the other is a fire beam which is a lot easier to avoid. Not sure which is which though.

[Alariel]

Originally posted by Gearwar:

Its been a while but depending of which demon you killed first ( I THINK!?!) the "special" of the demon prince changes. One is a barrage of meteors which is very hard to dodge and the other is a fire beam which is a lot easier to avoid. Not sure which is which though.

Yes. You need to kill the Demon in Pain first, and you'll get the laser beam Demon Prince.
When you drop down, the Demon from Below is on left side and will focus on you. The Demon in Pain is right side and starts with spitting poison.