RuneScape awards you to do wizardry like a wand

The other thing that I'd like to know is the proper recharge times of the abilities. Jagex has an incredibly annoying insisting on using seconds which are rounded in a way that is not precise, instead of using decimal values , or refer to it as "game ticks".
It is also important to NOT be asking pkers about dps since dps is not a factor in pking - it's about stuns or defensives, prayer interrupts and high burst damage combos. If you attempt to kill someone with standard pvm strategy they'll tank you for several days.
I purchased this Spider Orb from the Grand Exchange and used it in combat beneath the Barbarian Village. First thing I observed was that the animation seems to suggest that the spell comes directly from the Spider Orb (And not the Spider Wand, which I also have equipped).
On an Runescape wiki I found this information on Spider Orb: Spider Orb: "The Spider orb is a magical object used in the shield slot. This requires at least 20 Magic in order to put it on. It's the offhand counterpart for the web wand, it allows players to use the off-hand slot."
What I am not understanding is that it is the off-hand equivalent of the spider wand. It lets you cast spells with the off-hand slot. What exactly does this mean and do I need to bother using it at all? Also, I don't even know the meaning of "off-hand slot" means.
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