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> generally assume I'm wearing the mask when in public.

Got it.

> Do bonus actions stack?

When I looked this up, it said, "You cannot use more than one Bonus Action on a single turn, no matter how many feats you have that call for the use of a Bonus Action. If you have multiple feats that must use a bonus action to be put into play, you can only use one of those feats per turn."

> My plan is to sneak up to the spellsword using stealth, use my action for shape self and engulf his head so he can't breathe. Classic slime move. Then as bonus unarmed strike grapple him using DEX bc I can.

Engulf will be considered a grapple, in this special case you can suffocate as you grapple as a single action. You may then use a bonus unarmed strike. 1+STR MOD damage, is that you understanding?

> Theoretically the pseudopod is another bonus action but I leave it to Joy if I can use 2 bonus actions.

I am not counting it as a bonus action, however, I will allow 2 bonus actions if they're reasonable, like Ashley Panther Disengage and Hide similar to Goblin Disengage and Hide bonus actions once per turn.

> If I may, I will force my pseudopod into the spellsword's mouth and exert hydraulic pressure by grappling him

If you enter the mouth, I will allow him to bite as an improvised weapon 1d4+STR MOD guaranteed hit, so go through the nose if you are able or just cover both nose and face.

> hydraulic jack

I consulted Bear on this. He said it's plausible but you would only have a small pressure potential unless someone external to you pressed you (unless you have some sort of musculature like smooth muscle cells do for arteries), anyway you will have enough to hold on or form a shape in the esophagus and block the airway. 

Otherwise tell me what pressure you think you can exert on your own body in your pressure units of choice.

Vanilla suffocation is actually a very long process. it allows "a number of minutes equal to 1+CON MOD for a minimum of 30 seconds." So if he had a CON MOD of +2 it would take 3 minutes or 30 turns (6 seconds each) to suffocate him. Most battles are over in 5 turns. So as a strategy, it's poor. Then the suffocation phase would still take a number of turns equal to 1+CON MOD, again given +2 CON MOD, that would be 33 turns to get him to unconsciousness.

If you could somehow suck out his air and replace it with inert gas, that would skip to the suffocation phase, so 1+CON MOD turns to unconsciousness. Just sucking out his breath, I'll cut his ability to hold his breath equal to 20% or 30x.2=6 turns before suffocation so a total of 9 turns to unconsciousness.

Grappling will already:
1. offer advantage on attacks to the grappler
2. immobilize the grappled
3. cause the grappled to have disadvantage on attacks which will override advantage.
4. neither can cast spells requiring somatic gestures
5. the grappled cannot change weapons other than natural weapons

Should I give additional benefit for grappling with pseudopods? convince me.