It means that players from more advanced levels are able to attack you. It's best to put them in the bank and perform the Altar in RuneScape gold the event that you have enough bones, but it's up to the player to decide if they want to risk the equipment.
The other option of training is via the Slayer. During your Slayer assignments, you'll be able to gather a lot of Assouled Monster Heads, which can be reanimated using the Dark Altar. When you kill reanimated monsters, it gives huge amounts of Prayer experience but it is a less reliable method than regular bone farming, so don't be sure of getting enough Ensouled Heads to progress at levels from one to 99.
It requires a lot of Pure Essence for leveling purposes and this is earned by mining and monster drops. The first approach is simple, but not effective, as you would have spent hours mining rocks that don't provide any Mining experience.
It is why you want to focus on destroying Monster who not only offers Essence in huge quantities, but as well other valuable items may be of benefit to you. Most valuable are Gargoyles or Skeletal Wyverns on Slayer tasks. Players of higher levels can also farm Zulrah bosses for drop rewards at the end of the game and massive amounts pure Essence.
This isn't the only ways to earn Runes since you can also use some alternative ones in your favor. Temple Trekking minigame offers a huge amount of Essences with a little effort and, if you finish Ardougne Diary, you might be able to buy old school rs gold get daily runes from Wizard Cromperty.
