Frost Dragon

Frost Dragon health reads 93,330, 119,090 and 137,810. No other fight of the five gets longer at both difficulty steps, and the dragon that starts lightest ends 5,510 above the Fire Dragon on difficulty 3. The game's effective health for its stage runs about 16% over the listed value on the first two difficulties, 107,996 and 137,804, then equals it on difficulty 3. By that rating, difficulties 2 and 3 sit six points apart.

Magic starts at 88, the top dragon value on difficulty 1, so Frost Breath deals 376 to every hero there and 458 on difficulty 3, where Magic is 129. The Frost that comes with it, about 45 per breath and 8 per auto attack, or 62 and 11 on difficulty 3, slows heroes without hurting them: ticking Frost only deals damage through Glacial Decay Engine, and that relic turns it against enemies. Health lost in this fight comes from the breath and from auto attacks splashing onto neighbours.

The same slow is what Frost Dragon's Chill carries: stacking Frost on every hero when combat starts, 3 more with each combat victory.

A breath with a fixed value per difficulty lets flat Shields be sized in advance. Shield Generator gives every hero 400 lasting Shields at combat start, which on paper covers one 376 breath on the first two difficulties and falls 58 short on difficulty 3. Rush Duelists Stack is the only tier list build that runs it.