It also gives +1 hit point per level for every even point of CON starting at 12 for warriors, and at 14 for non-warriors. If you use the "max hit point rolls" game option, this should approximate higher-than-average rolls in the original system, but with zero variability. Like the ...
Moves Mirror Image to 3rd level. A straight nerf. But Illusion also has Blur at 2nd level, and having two illusionary protection spells there seems silly - and there are none at 3rd level. Mirror Image is incredibly useful, I think it works quite well one level below Stoneskin. (Pro tip...