Orth watches the troll land and sighs before raging! (+4 str con -2 ac ...so 17?)

Not 100% sure if this is ok so DM let me know

Orth let's out a roar of rage and charges at the troll pulling out his greatsword in the process and swings!
Spoiler: if charge is allowed
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(3d20)[2][19][4](25) +15
(2d6)[8] +10(x2 if 19-20 crit) and (1d6)[6] fire
Oh and Ac is 15 until my next turn


Spoiler: if DM says no charge
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pull sword as part of move action then attack
(3d20)[2][5][8](15) +13
Damage (2d6)[5] +10 (x2 if 19-20 crit) and (1d6)[4] fire damage
Ac remains 17