Izek

What we know

Baron Vargas Vallakovich's enforcer; ~seven feet tall; bald; messy stubble; silver battleaxe on back (Session 10 @ 00:49:14)
Right arm hidden under robes; abnormally large (Session 10 @ 00:52:58)
Baron addressed him as Isik; Wilhelmina Rikalova and Henrik called him Ezek (Session 10 @ 00:55:59)
Wilhelmina Rikalova: right arm possessed by demonic entity; disfigured and spews fire (Session 10 @ 01:05:26)
Izek was town guard captain and Baron's right-hand enforcer (Session 11 @ 01:05:24)
Nearly seized Saturno after shoe incident before Baron intervened (Session 10 @ 00:55:59)
Masked alley ally advised investigating Izek—heavy drinker at Baron's ale supply (Session 12 @ 03:10:28)
Daily routine per Ernst: wakes ~11 a.m.; gate rounds with two guards; 1 p.m. lunch + two wines in town square; 2 p.m. bully "spies"; 5:30 p.m. alone at Lake Zarovich with second bottle (Session 15 @ 00:52:09)
Usual wines: Purple Grape Mash No. 3 and Red Dragon Crush (Session 15 @ 00:56:20)
Killed at Lake Zarovich after poisoned Red Dragon Crush; ambushed by party (Session 15 @ 04:20:20)
Post-death fire explosion damaged Sildir and others (Session 15 @ 04:23:09)
Carried Izek's Symbol Parchment and Izek's Doll resembling Ireena Kolyana (Session 15 @ 04:32:16)
Sildir took oversized arm as proof for Lady Fiona Wachter (Session 15 @ 04:34:38)
Saturno holds cooled Izek's Silver Battleaxe (Session 15 @ 04:27:49)

Baron Vargas Vallakovich's street procession during Session 10 (Session 10 @ 00:49:14).

Final fight at Lake Zarovich lakeshore; killed by Saturno (Session 15 @ 04:19:59)

Unconfirmed: who wrote symbol parchment; link to kidnappers (Session 15 @ 04:31:16)
Unconfirmed: why he carried Ireena-lookalike doll (Session 15 @ 04:32:38)