Tenser's Transformation

[ Transformation de Tenser ]
level 6 - transmutation
Casting Time: 1 action
Range: Self
Components: V, S, M (a few hairs from a bull)
Duration: Concentration, up to 10 minutes

Description not available (not OGL).
But here is a summary:

The caster gains 50 hp, advantage to attack rolls, an extra 2d12 force damage, martial proficiencies and two attacks per round.
Wizard
Xanathar´s Guide to Everything
  1. DnD 5e Spells › Tenser's Transformation