Charge is a magicspell that increases the maximum damage of the God Spells from 18 to 25. This spell requires level 80 magic to use, and you must have a god staff and the corresponding cape to use. P2P mages almost always use this spell before a battle for extra damage in combat.
Charge spell glitches some doors and scenery objects when cast on them. It makes the object disappear. The glitch is repaired by logging out and back in.
Charging is one of the best if not the best experience rate in the game. However, constant charging next to a bed is very costly in blood-runes and does not yield any loot or extra benefit. Charging is up to 270k experience per hour.