HOW I would have reworked shen
Passive : atmas impaler : shen has stolen atmas impaler from the riot archives. He now uses it as his weapon. Shen Gains 1 ad for each 80 health he has.
Q: vorpal spear: shen throws a spear at an enemy dealing physical damage and marking them. If Shen or an ally attack an enemy that has been speared they are dealt 5% of shens max health and the champion who triggered the mark is healed for that much over 4 seconds.
W: faint sheild: Passive : every 2 seconds shen Gains 0.25% of his max health as a sheild up to a maximum of 10% Active: for 6 seconds shens basic attacks grant him 15\30/40/50/60 sheild per hit
E: same taunt
R: same sheild ult thing