A friend of mine from a different RPG subculture wants to have us all make level 20 characters for an arena fight, using 3.5 rules with back-porting of Pathfinder material allowed. We've tried to explain to him why this is a bad idea, but he's set on it and unflappably convinced that it will go fine, so we're giving it a shot. 

In the context of this scenario, I'm making a 20th level factotum (cause someone else already called the god-Cleric and I've never found Batman to be that fun to play/make). Since inspiration is refreshed at the beginning of each encounter, it is desirable that I be able to force an encounter to begin or end vis a via some sort of character ability.

I'm *not* looking for abilities that cause an encounter to end because the encounter is actually finished-- abilities that instantly kill all enemies with no saving throw, for example, are insufficient. I'm looking for abilities (or rules that abilities might trigger) that explicitly state "The encounter ends" or "This ends combat" or "The affected character is removed from the encounter" or similar.

Since beginning an encounter is what provides inspiration, abilities that reference encounters that way, allowing me to start a new encounter with one in progress, could also work.

Since I'm taking at least 19 levels of Factotum, answers shouldn't suggest abilities that require more than a single level dip in a class. 

The GM has also decided that CR= *total* LA, except when a LA is listed in which that that LA = *total* LA, so if there's a CR 0-1 or LA 0-1 creature (regardless of HD), that could work.

Since I'm taking levels in Factotum, all my feats are in Font of Inspiration. Like, all of them. Anything that would cost a feat or change my race from Human needs to explain how doing so is worth the inspiration it costs. With 8 feats in Font of Inspiration, losing a single feat costs me 8 Inspiration points per encounter. The only thing so far worth not putting the feat in for is the Pathfinder Hero Point System, which would allow me an extra feat if I declare myself an antihero, but our team's Cleric is grabbing a custom magic item of at-will *Greater Glyph of Warding* and one of at-will *Mass Heroic Fortune* and access to that sort of hero point supply is sufficient to trump the inspiration from the feat.

So, that said, how can I best cause an encounter to technically begin or end?