Archvillain

Archvillains are extremely powerful entities. They con +5 to their level. Their HP are usually in the 10's of thousands (whereas bosses are around 1000-2000). Approach with extreme caution and about 7 buddies.

Archvillains are most noteworthy for having, in addition to massive hit points and regeneration and near-immunity to mez two thirds of the time, a significant resistance to many debuffs that scales by level. That resistance, as of Issue 9, applies to -RunSpeed, -Recharge, -Endurance, -ToHit, -Defense, -Perception, -Regeneration, and -Recovery.

Level	AV Res Mod
1	0.6
2	0.6
3	0.61
4	0.61
5	0.62
6	0.63
7	0.63
8	0.64
9	0.64
10	0.65
11	0.65
12	0.66
13	0.66
14	0.67
15	0.67
16	0.68
17	0.68
18	0.69
19	0.69
20	0.7
21	0.7
22	0.71
23	0.71
24	0.72
25	0.72
26	0.73
27	0.73
28	0.74
29	0.74
30	0.75
31	0.75
32	0.76
33	0.76
34	0.77
35	0.77
36	0.78
37	0.78
38	0.79
39	0.79
40	0.8
41	0.8
42	0.81
43	0.81
44	0.82
45	0.82
46	0.83
47	0.83
48	0.84
49	0.84
50	0.85
51	0.85
52	0.86
53	0.86
54	0.87
55	0.87

So, for example, while it might seem as though a Defender's Radiation Infection should be valuable against Captain Mako in the Statesman Task Force, to deal with his Elude, it is in fact heavily resisted. 3-slotted, it would do -61% Defense, which should cripple him, but as it's against a +4 enemy it is at half strength (-61 * .5 = -30.5), and as it's against a level 54 Archvillain a further 87% of that is resisted (-30.5 * (1 - .87) = -3.965%), leaving the net effect approximately a third as useful at bypassing defense as an Insight inspiration. Likewise, even against an even-con AV, a 50's Lingering Radiation's mighty -500% Regen debuff will be dropped to approximately -65%.