The witch Bolt 5e can be defined as a ray of crackling blue energy lances out towards a creature within range, forming an arc of lightning between the target and you. You can make a ranged spell attack against that creature.
On your hit the target takes 1 d12 lightning damage and on each turn of yours for the duration, you can utilize your action to deal 1d12 lightning damage automatically to the target. If you use your action for something else then the spell ends. Also if the target is ever outside the spells range the spell ends or if it has total cover from you.
At higher levels – when you cast this spell using a second level or higher spell slot, the initial damage increases by 1d12 for each slot level above the first.
For the Witch Bolt 5e there are certain rules to be followed-
Rules - Beyond 1st level
As your character moves for adventures and overcome challenges, he gets the required experience, shown by the experience points. Characters who approach a specified experience point total moves ahead in capability. This advancement is called gaining a level.
When the character gains a level, his class grants additional features, as mentioned in the class description. Some of these features help you to increase your ability scores on either 2 scores by 1 each or increasing 1 score by 2. Ability scores can’t be increased above 20. The proficiency bonus of every character increases at certain levels.
Each time you gain a level, you get one additional hit die. You can roll that hit die at your constitution modifier to the roll and then add the total to your hitpoint. You can use the fixed value in your class entry, which is the average result of the die roll.
When the constitution modifier increases by one your hitpoint maximum also increases by one for each level you have attained. The character advancement table summarises the XP you require to advance and levels from level 1 to Level 20, and also the proficiency of the character of that level. You can view the information in your character’s class description to find out what other improvements you gain at each level.
Languages – Your race will show the languages your character can speak by default and your background may give you entry to one or more additional languages of your choice.
You can note these languages on your character sheet. With the permission of your DM you can select a language from the Exotic languages table or a secret language such as thieves cant.
Actually some of these languages are families of languages containing many dialects. For example the primordial language consists of the Aquan, Auran, Terran and Ignan dialogues one for every for elemental planes. Creatures who can speak different dialects of the same language can easily communicate with one another.
Multiclassing – multiclassing helps to gain levels in multiple classes. This lets you make the abilities of those classes to realise a character concept that may not be reflected in one of the options of standard class./p>
With this rule, you get the option of gaining a level in a new Class whenever you move ahead in level instead of gaining a level in your present class. Your levels in your classes altogether are added to determine your character level. For example if you have two levels in Fighter, 3 levels in Wizard, you are a 5th level character.
As you move ahead in levels, you might remain a member of your original class with a few levels in another class or you may change the entire course, not looking back at the class you have left behind. You may even start moving ahead in a third or fourth class. Compared to a single class character of the same level, you sacrifice some focus in exchange for versatility.
Pre-requisites – For a new class to qualify, you must meet the ability scores prerequisites for both your new class and your current class. For example, a Barbarian, who has decided to multiclass into the druid class must have both wisdom and strength scores of 13 or higher.
Without the complete training that a new character receives, you must be a quick study in your new class, showing a natural aptitude that is reflected by more than average ability scores.
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