Runes of Magic is designed for questing*.
You could get some power-levelling from a friend letting you tag along behind them in a higher-level dungeon but this will result in problems later.
- Some dungeons will remain locked to you (these are just the ones on the first continent of Candara):
- Arcane Chamber of Sathkur
- Ruins of the Ice Dwarf Kingdom (Both level 35 & level 50 versions)
- Treasure Trove
- Pasper's Shrine
- Mystic Altar
- Cyclops Lair
- Heart of the Ocean
- Zurhidon Stronghold
- Lair of the Demon Dragon
- Cave of the Water Dragon
- Hall of the Demon Lord
- Access to further continents and the various Islands will remain inaccessible.
- Ingame resources will not be so easily obtained - questing gives gold and useful gear, especially at later levels.
After level 25(ish), and especially beyond level 50, the amount of XP required to level increases massively.
This means you'll be left killing mobs for so much more time than at the very low levels. Even using XP boosts from furniture and pet eggs, this will be a painfully slow and laborious process.
So, I write this cautionary post, ending with what I said at first:
Runes of Magic is designed for questing*.
*But don't let others dictate how you want to play - we're just offering you our observations...