If you have the right herblore level you can make the potion, otherwise you will have to buy Weapon Poison in the Grand Exchange, then use the potion on your dagger to poison it.
A guide to getting the best weapon poison:
Weapon Poison = Cheapest and weakest of the three.
Weapon Poison P+ = Moderately Priced, Better than Original Weapon Poison damage wise.
Weapon Poison P++ = Costs slightly more than P+, better that Weapon Poison P+ damage wise.
If you want the best value for your money, get P++ its the best of the 3 and should cost somewhere under 10k.
Buy both and add poison to the dagger. That way u can use the special with the longsword and u can poison the thing you are fightingi have bith just wanted to know but ty, oh and poison dont give xp
dragon dagger
bronze dagger
536 dragon dagger poison p++ will be19,783,224gp
5698
Dragon Dagger Poison
No it doesn't luckily.
No one takes the dagger away from Romeo: there is nobody there but him, and even if there were, he kills himself with poison, not a dagger. Juliet kills herself with the dagger.
Around 30 - 40k
Grand Exchange
Romeo kills himself with poison bought from the apothecary and Juliet stabs herself with Romeo's dagger.
slashscape is a game like runescape.it is runescape but they just changed it and made edgeville home.it is runescape before the update graphics.you can get runescape member things in slashscape, like:white amour,dark bow dragon dagger(s) (s is super poison) there are more things in slashscape like:whips(white,rune,dragon) and abyssal) and bow sword