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If a player has a +1 Dagger (example), and then he score a critical hit, is the "+1" thing doubled too or just the damage dice? Will the damage be 2d4 +1 +ability mod or 2d4 +2 +ability mod?
If a sword deals 1d6 +2 necrotic damage, is only the "+2" necrotic or all of the damage?
On the 2nd question, if crits, the +2 is doubled too?
I'm trying to use only the official rules.
PHB, pg. 196
Roll all of the attack's damage dice twice and add them together. Then add any relevant modifiers as normal.
Crits only double the dice rolled, not the modifiers. It also doubles any and all dice applied to the damage. If a spell or ability added any dice to the attack damage, you roll those twice as well. So, a +1 dagger does 2d4 + 1 damage on crit. Another example, Eldritch Blast hitting a target affected by Hex does 1d10 + 1d6 normally and 2d10 + 2d6 on crit, plus any relevant modifiers such as Agonizing Blast.
When damage is listed for any weapon, attack, spell, etc it applies to all of the dice and modifiers that come before the damage type. Thus, a weapon that does 1d6+2 slashing does all slashing. A weapon that does 1d6 slashing +2 necrotic will do 1d6 slashing damage and 2 necrotic. If it were listed as 1d6 +2 necrotic, it will do all necrotic damage. Damage types are never assumed, they are explicit.
1) Only the damage dice are doubled. The modifiers are not.
So in your example, a +1 dagger that crits, will deal 2d4+1+abmod damage.
2) Usually only the +2 is necrotic. The 1d6 will be normal damage type (for a sword, likely Slashing or Piercing). However, this kind of depends on what effect exactly gives the +2 necrotic damage. Certain effects may say that all of the damage becomes necrotic. These should usually mention that.
3) The +2 is not doubled. The sword, if it crits, will deal 2d6+2+abmod damage.
