Tenser's Apotheosis

You endow yourself with enhanced endurance and strength, and martial prowess fueled by magic. Until the spell ends, you can only cast 3rd level and below spells, and you gain the following benefits:

• Your hit point maximum increases by 50. 
• You regenerate 10 hit points at the start of your turn if you have at least 1 hit point remaining.
• You have advantage on attack rolls that you make with simple and martial weapons.
• When you hit a target with a weapon attack, that target takes an extra 2d12 force damage. You deal 6d12 force damage on critical hit.
• You have proficiency with all armor, shields, simple weapons, and martial weapons.
• You manifest a suit of armor over yourself, which can be any medium or heavy armor, or if you are already wearing armor, increase your AC by 2.
• You have proficiency in Strength and Constitution saving throws. Your strength and constitution scores increase by 4, up to a maximum of 24.
• You can attack thrice, instead of once (or twice with the extra attack feature), when you take the Attack action on your turn.

Immediately after the spell ends, you must succeed on a DC 20 Constitution saving throw or suffer one level of exhaustion and be incapacitated until the start of your next turn.