Vanguard Style Class

I just finished playing Mass Effect 2 and 3, and I played as the Vanguard class and had an idea how about Vanguard inspired Champion. Passive- The Vanguard generates a shield while not taking damage which he/she can use for his/her other spells. Q- Something along the lines of the Shockwave skill, but only slowing champions, and a small part of the damage done can recharge his shield. W- Similar to the Pull, reducing enemy Armor and MR by a small amount and slowing them. E- The Biotic Charge which stuns the target for a second and and stunning all nearby targets for a smaller amount. R- Nova! Expends all shields to deal damage based on shields. Thanks for reading and tell me what you think :) -Rito Jeembas