Quote from thegeneral_bg >>

Can you hit creature that you can't see within range?? Ex. Full cover.

In Frostbite it is stated that you have to see the target, but hire is not. 

"...creature that you can see within range"

 Yes, but not from full cover. Full cover makes it impossible to target the creature behind full cover using spells or attacks. However, if you can see the creature because you are blinded, your in an area heavily obscured, it the creature is invisible, or any other such circumstance, you can still target them.

Quote from Leandrokos >>

You see, Warlocks have Eldritch Blast which is pretty much the same, but with force damage.  It might actually be better because according to my experience not a lot of monsters have a resistance to force damage.

Quote from Herothemaster >>

Quote from Dartagnan_Galochio >>

So, acknowledging Eldritch Blast, why doesn't Warlock get both that AND this?

 Balance purposes can't make the always resting warlock have to many good cantrips jk... But yeah probably to limit how many similar cantrips the warlock has because the only real difference is damage type. You'll only be able to carry both if your DM allows you to which honestly in my personal does very little to help your character. 

 It is very much a better cantrip. It can target multiple creatures, hits multiple times rather then increasing damage (usually not important but can cause incredible damage increases with a hex spell or something else that triggers upon damage, and it has a damage type that is never naturally resisted and only incredibly rarely immune.

Eldritch Blast is the Flavor Contemporary

How big is a mote? Like im imagining something similar to a baby fireball

I'd guess that a mote is like a pebble or sling bullet.

Not your fault the dm ruined it

Quote from OsleyHerald >>

Because this is a ranged attack that the caster needs to roll to hit, I'm guessing use the same rules for other ranged attacks.

Total Cover

A target with total cover can't be targeted directly by an attack or a spell, although some spells can reach such a target by including it in an area of effect. A target has total cover if it is completely concealed by an obstacle.

 Yes. A ranged spell attack is subject to cover like any ranged attack.

Unless you take the Spell Sniper feat, and then you can ignore half and three-quarters cover and hit anything you have line of sight to any part of.

Can someone explain why it only ignites things that aren't on their body? Is it for balancing purposes?

following for clarification also. does this mean the person burns, and their clothes are untouched??

Quote from Dartagnan_Galochio >>

So, acknowledging Eldritch Blast, why doesn't Warlock get both that AND this?

 Thematically, Warlocks draw their power from higher beings and not the weave, so they generally have less pure elemental manipulation and more raw energy/magic themed abilities. When warlocks do elemental damage its more themed as channeled through something else, like a rebuke or a sword rather than materialized into existence. Compare https://www.dndbeyond.com/spells/class/warlock?filter-search=&filter-damage-type=51&filter-verbal=&filter-somatic=&filter-material=&filter-concentration=&filter-ritual=&filter-sub-class= with https://www.dndbeyond.com/spells/class/wizard?filter-search=&filter-damage-type=51&filter-verbal=&filter-somatic=&filter-material=&filter-concentration=&filter-ritual=&filter-sub-class=

Why don't Fiend Warlocks, forge clerics or Wildfire Druids get it? Is it because they already have better/similar cantrips? (Eldritch blast, Sacred Flame, Create Flame)

I Think warlocks should be given the option to not use their most well known cantrip, for those who want to roleplay being a fireslinger (and don't just want to say their eldritch blast is reddish orange)

(That said, you could make a Vuman or CL and take the Spell Sniper feat like l just did)

Quote from DnDNewper >>

Why don't Fiend Warlocks, forge clerics or Wildfire Druids get it? Is it because they already have better/similar cantrips? (Eldritch blast, Sacred Flame, Create Flame)

I Think warlocks should be given the option to not use their most well known cantrip, for those who want to roleplay being a fireslinger (and don't just want to say their eldritch blast is reddish orange)

(That said, you could make a Vuman or CL and take the Spell Sniper feat like l just did)

 Most Subclasses do not add cantrips to the character’s spell list.

yes but it is just worse eldritch blast because a lot more things are immune to fire than force

This is the best damage cantrip in the game simply because it can destroy objects and cover. Fire isn't a great damage type, but this can destroy wizard spellbooks, archers bows, fighters great swords, and clerics holy symbols. No other spell in the game lets you interact with objects like this spell does, it is a powerful tool in the hands of a veteran DM that knows what they're doing. 

Since this is a spell attack and not a save, any creature behind total cover would not be targetable based on the cover ruleset. (1/2 cover= +2AC or 3/4 cover = +5AC, total cover= no target.)

Quote from Welshliamb >>

How big is a mote? Like im imagining something similar to a baby fireball

 I imagine it's like a roman candle or a bottle rocket. It shoots a little ball that explodes on contact.

"Anyway, Firebolt!"

-Unknown creature

Quote from Dartagnan_Galochio >>

So, acknowledging Eldritch Blast, why doesn't Warlock get both that AND this?

 Warlock can actually get this spell if you choose the Pact of the Tome feature. 

It's just kind of pointless because of eldritch blast 

They are just not that different