Dual Casting

This feat allows the user to cast the same spell twice at the same time provided they have the components (i.e. if you need a visual/hand sign then you must have both hands making the hand signs). For spells that have instantaneous damaging spells such as magic missile, both effects of both spells happen at the same time. For spells that cause movement, or require a weapon attack, such as misty step, and green-flame blade, the effects of the spells take place at different times. As for misty step, the user would first teleport the maximum they wanted to teleport, then do so again as part of the same action. For spells such as green-flame blade that require a melee attack, the effect doesn’t stack on one attack rather they must be split among two attacks, and if both attacks are not acted upon then the remaining spells fail. For spells with longer duration such as mage hand, the effects are cast at the same time, but doesn’t increase the functionality of either of the spells. As for spells like mage hand that you can edit and use for bonus actions, you can do so for both spells currently active. Keep in mind when duel casting you just cast the same spell twice. You may not cast two different spells unless one of the spells doesn’t require a verbal component, in which case you may cast one spell with one hand using a verbal component and another spell with the other hand as long as it doesn’t require a verbal component. Spells that require concentration, can be done Simultaneously, but the concentration check made for the second spell has disadvantage. Concentration spells, and those similar to such effects do not stack, though they can be cast on multiple targets at the same time. For spells that cause AOE or saving throws, the caster can decide where to put both AOEs. Tiles that are effected by the same spell have the effects of only one spell being cast. For spells that have the cone, or line effects, the caster decides which direction the two spells go in. Also keep in mind that when casting two spells at once, if they require spell slots then you must use spell slots for both spells. All material values of spells are doubled if they have a cost.