Tips for Sentinel?

[Das Big Hippo]

I really like Void Titan over all of the others. Can anyone give me some tips on how to play it at end game?

[Jagdtiger]

The only seriously viable part of sentinel's kit is controlled demolition feeding into immortality when using void weapons and 100% super uptime on bubble. Focus on regenerating your grenade with either scatter or vortex, and use that to feed into permanent (or high uptime) volatile rounds for a void weapon of choice. Good options are the classic funnelweb, repulsor+demo unforgiven, or a reconstruction/FTTC+killing tally commemoration. The main damage comes from chain reactions on your volatile procs, and using that can allow you to play quite aggressive with constant health regen+overshield gen + devour. Bubble should have 100% uptime with at least 1 ashes to assets in legend or lower tier, master and GM it's better used as a panic pop or to allow you to regain space.

You can also use Doom fang pauldrons for true 100% roaming super uptime (as in you pop one super and it literally never runs out), but that's very difficult if you have teammates stealing your kills, master or GM tier content, or any lapse in combat, so it's more of a meme. Graviton lance is a potent exotic, though its enormous chain reaction ability often invalidates your subclass and steals your own kills from you, so collective obligation is a weaker option that has better synergy. For true endgame with no primaries, void isn't really a great pick on titan, so you'll probably need to be running something sweaty like conditional+forbearance to keep up.

tl;dr anything and everything volatile and grenades are the way to go