Liquid XP

Experience is converted into Liquid XP, which is stored in an internal buffer of the block placed on top of the converter. Each bucket of the liquid holds experience equal to a fixed amount, and the converter only drains a player down to level 15, so a small remainder is always left behind because of rounding in how Minecraft tracks experience. Emitted liquid moves to nearby pipes, liquiducts, tanks and other blocks that accept liquid, so a separate mod that carries liquids is needed to move it between machines. A wooden pipe and a redstone-powered liquiduct are also needed for some layouts.

An absorber block works like a reverse of the converter: instead of taking experience from the player, it collects experience orbs in a 13 by 13 by 13 area centered six blocks in its facing direction. It is not enough on its own to build an automatic experience farm. Mobs drop experience only when they are killed by a player, so the Collector instead counts player kills and pumped Liquid XP increases the chance of nearby mob deaths for a cost of one experience point per catalyzed mob, while mobs that leave its range only drop experience if they die within three seconds.