Guild Wars 2

It’s a base 10s, but unlike the other signets Signet of Malice’s might doesn’t increase in duration when you have additional boon duration or might duration (for example Runes of Strength). I compared them all to show the difference. The other four signets seem to be fine. If you look at the Signet of Malice’s tooltip, it also says that the 5 stacks of might would give 175 power and 175 condition damage, when all other signets say 150 power and 150 condition damage.

All testing was done in the PvP Lobby.

Screenshots:

With no might/boon duration:
Signets of Power tooltip: http://prntscr.com/72poyn

Malice: http://prntscr.com/72pkqe
Assassin’s: http://prntscr.com/72pkwy
Infiltrator’s: http://prntscr.com/72plvy
Agility: http://prntscr.com/72pm7a
Shadows: http://prntscr.com/72pmht

With Runes of Strength and 10% boon duration:
Signets of Power tooltip: http://prntscr.com/72ppd1

Malice: http://prntscr.com/72pk2f
Assassin’s: http://prntscr.com/72pk92
Infiltrator’s: http://prntscr.com/72po5j
Agility: http://prntscr.com/72podz
Shadows: http://prntscr.com/72poj3