so its probably not a unique idea at this point but this is what i sometimes use for terminus when im tired of decimation. basically an alternate way of playing terminus. instead of waiting for the enemy to start blasting you for calamity charges, you go to them and take the calamity charges. its very good against something like double tank i find because you can just pressure both the enemy tank and off tank and soak up their damage pretty much at the same time because of your speed. the items i listed all work well ,but against double tank you will be wanting cauterize especially and depending on then character maybe some resilience (a character that can hit you with a cc effect through your siphon, like ash with her shoulder bash for example). i like to use undying with this because though it may be his worst talent, with this set up it makes sense and can provide some decent benefit (helps when backing up from the enemies if you are playing more of an off tank). also with haven or blast shields you can really be the definition of a tank, with about 48% damage resistance while below 40% health and a bit less when above 40% health.

to sum it up, you are trying to apply alot of pressure with your fast speed while also being hard to take down by managing your siphon properly combined with your high levels of damage resistance. i also find it a bit more fun than decimation terminus.