That’s quiet simple! When you die you keep your experience points.
Well…that’s not 100 percent true… As you know you lose a certain amount of XP points when you die. That’s why you only keep your XP before death minus the amount of XP you lose at your place of death; so when you collect them you’re at the same XP score as before.
Is this mod multiplayer compatible?
Yep. As long as both – Client and Server – have installed it, this mod should run without a problem on your forge server.
How to install it?
1) Download and install Forge.
2) Download this mod and place the .jar into your Mods Directory (.minecraft\mods).
What’s coming next?
In the future I planned to bring an item in game, similar to the Bottle o’ Enchanting, which gives you a certain amount of XP when you splash it on the ground. How much it gives you? You decide! When you have enough level you can save these levels in bottles and store them for bad times.
And no, I do not know when this feature will be released. Coming when it’s ready!

Download Mod: XPyourself Mod for Minecraft 1.8 - Minecraft 1.8 Mods