Eldritch Knight's (Weapon) Thunder Boon

You enhance one melee weapon you are wielding to deal an extra 2d12 thunder damage for one minute.

If you are wielding a two-handed weapon, you deal 3d12 thunder damage for one minute instead.

Higher Levels. If you cast this spell at 2nd level or higher, the extra thunder damage increases by 1d12 for every spell slot above 1st.