I create a nano-organism which is loaded with titanium and other heavy metal digesting enzymes and release it on your fortress.
Then I create two more nano-organism one is host specific to humans and can solidify plasma (the liquid component of human blood), I call it N1 and another deadly one, which is again host specific to human and can undergo rapid growth once it infects its victim and spread.
It kills its host within a minute of contact. I call it N2. (And create an antidote for it).
Now I approach one of your slave government with the cure for your "Titanium disappearance" (of course the cure is fake).
They take me to your headquarters where me and my squad in guise of releasing the Anti-titanium eating bug, secretly mix N1 in the doughnuts, pizzas, other eatables, drinks and beverages supply of your army.
Now your army starts falling ill (and you too). Your slave governments plan to destroy my labs. But I threaten them and ask them to join me or else I'll release an even more deadlier disease (N2) on their lands.
They oblige (but nevertheless, I'll kill all the government leaders around the world who supported Yama once my work is done, such fickles should not be trusted ya know) and I proceed towards the hill with N2 and the armies of the governments.
I blackmail Yama to transfer ownership of his fortress to me otherwise I'll release the deadly disease, (you are in your death throes anyways) you reject and I inject N2 in your ill soldiers and you watch them suffer so hard in front of you and die. Ultimately, you transfer the ownership to me and as a favor I let you die by N1.
Now I reinforce and rebuild your fortress (oh it's mine now).Sterilize the hill with anti-N1 and Anti-N2. Kill the governments under you (as already stated) and surround the hill with all the world's deadly diseases (along with N1 and N2) as a defensive barrier, while I stay inside the fortress, with my squad and army. Everyone is vaccinated like hell and resistant to all the diseases except N2, for which they have to take the Antidote every day (can't let them betray me lel.)
I now control the hill.
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