A true Tsolo, if you don't count dropping Thor to manipulate the dragon into using the AoE - a tactic I wasn't sure would work, hence the use of a clock. Further testing showed that didn't work, the dragon still might use its ST skill (on Thor), but hey, Thor did basically no damage in this run.
Can be done without dropping - or even bringing - Thor, but it's very RNG as it requires the dragon to use its skills in the right order and to not crit on any of the last four hits.
Units and gear used:
Tsu here uses a Slayer's Emblem rather than the Prisoner's Gear she uses for most of the other maps. The rest is standard, Monkey King Vest, her exclusive, and an EMB for close-range counters.
I've stopped making these videos because my computer stopped being able to run Langrisser so I can't capture video footage of the game, but in the meantime, I've figured out the Tsu+FB strats for the other Anikis, Ice Dragon, some bonding realms, and there're a couple of true tsolos in there. Thor being a higher level (with more hero/soldier stat buffs) also means I might come back to these dragon runs and try to do them without dropping Thor at all.