[@EruditeAssassin] Alright, I'll do my own analysis about it and you can correct me where I am mistaken!

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[*] You seem to begin with your breath weapon, using a single action. You do 2d6 fire damage in a cone, with the opponents making a Dex save for halved damage.
[*] You then, instead of contesting the grapple try to turn it onto the guard. This is up to DM to interpret as to how many actions it takes if any, so I won't say anything regarding that.
[*] Proceeding to make a weapon attack, you use another action. 19 does not crit unless a class feature/feat says it does and you shouldn't have either. Besides, the damage is a bit off. The modifier is added, not used to multiply :)
[*] Then there's the intimidation. Again, up to DM to determine the amount of actions so I won't go into it.
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Thing is, you only have a single (1) action per turn in combat as restricted by rules on PHB p. 189. There is quite a lot of extra you have there. Extra attack only apply on the Attack action, by the way, and usually people get them by level 5. Does not work on Breath Weapon though.