WARNING!
Talent "Threat of Thassarian" is supposed add off-hand's damage to these abilities: Death Strike, Obliterate, Plague Strike, Rune Strike, Blood Strike and Frost Strike(doesn't work with this one at all).
But, besides doing this, it also makes these abilities apply their special effect twice and that it shouldn't do. Well since other abilities have either none or each-application-overwrites-the-previous special effects, the only problem is Death Strike which now heals the DK twice.
DB PATCH SIDE been included in revisions please check whether it is there
this part in revision
insert into spell_chain values (65661,0,65661,1,0),
(66191,65661,65661,2,0),
(66192,66191,65661,3,0);
to check:
alter table `spell_proc_event` change `entry` `entry` mediumint(5) UNSIGNED default '0' NOT NULL;
DELETE FROM `spell_proc_event` WHERE `entry` IN (65661);
INSERT INTO `spell_proc_event` VALUES
(65661, 0, 15, 0x00400010, 0x20020004, 0x00000000, 0x00000010, 0x00000001, 0.000000, 100.000000, 0);