For his "Deadly Touch", I believe I had something like that once... Give me a moment.
Ah, here it is, the "Touch of Shadows"-poison from my Shadowlings (they were made for DF v0.31.16 though, I'm not sure if they'll still work) And yes, I know most of the syndrome is pure sadistic torture (like rotting away the eyes)
[SYNDROME]
[SYN_NAME:Touch of Shadows] I suggest you rename this with something of your own
[SYN_AFFECTED_CLASS:GENERAL_POISON]
[SYN_IMMUNE_CREATURE:SHADOWLING:ALL] This poison used to be their BLOOD, but you don't really need to worry about this
[SYN_CONTACT] Again, only needed so enemies would die after cutting a Shadowling
[SYN_INJECTED] This is what you need for your touch
[CE_BLEEDING:SEV:130:PROB:100:BP:BY_CATEGORY:ALL:SKIN:RESISTABLE:START:10:PEAK:1000:END:5000] So yeah, um, extreme blood loss
[CE_NECROSIS:SEV:3000:PROB:100:BP:BY_CATEGORY:EYE:ALL:RESISTABLE:START:10:PEAK:1000:END:5000] Instant blindness
[CE_IMPAIR_FUNCTION:SEV:100000:PROB:10:BP:BY_CATEGORY:HEART:ALL:RESISTABLE:START:1:PEAK:1000:END:1000] Heart failure
[CE_PARALYSIS:SEV:100:PROB:100:BP:BY_CATEGORY:LIMB:ALL:RESISTABLE:START:50:PEAK:800:END:3000] Full paralysis
To make it kill faster, go to the line with CE_NECROSIS and replace "EYE" with "BRAIN" and remove "RESISTABLE" (I think) You can also increase the severity numbers. (Though I'm not sure if it does anything if it's >100, but it never hurts to overdo something) You could also just instant-necrosify the whole body.
IMAGE: Night. A steel-clad dwarf alone on a hill. A lean, tall figure shrouded in a cloak walking towards the dwarf. The dwarf takes on a battle stance, two battleaxes ready to cut of some limbs. The shrouded figure extends a bony hand and touches the dwarf with a single finger. A single gasped breath. The dwarf then collapses to his knees and falls over. Zoom in on face: His face is visibly rotting away, moments later only his skeleton and armor are left. The shrouded figure is gone. [/IMAGE]
Now to inject the syndrome I used
[ATTACK:PUNCH:BODYPART:BY_TYPE:GRASP] standard attack, you know how it goes.
[ATTACK_SKILL:GRASP_STRIKE]
[ATTACK_VERB:touch:touches]
[ATTACK_CONTACT_PERC:100]
[ATTACK_FLAG_WITH]
[ATTACK_PRIORITY:MAIN]
[SPECIALATTACK_INJECT_EXTRACT:LOCAL_CREATURE_MAT:POISON:LIQUID:100:100] You need this to use the poison
It's already flavored to display "touch". Ah, the good old times in the Arena: "Shadowling 1 touches Dragon 1 in blablabla(anything), fracturing the bone, tearing the muscle etc... Dragon 1 gives in to pain... Dragon 1 has been struck down"
I hope this works for you, it's been quite a while since I last used syndromes. I believe you also had to link the syndrome up with a fluid, but I can't remember how I named it (though it had a fixed temp of 0, so it'd kill you even if you resisted the poison. Might be worth considering for your DEATH)