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Easy way to kill Thaxll'ssillyia (no mods).
Looks like I found one fun and easy method (no mods) to kill the Shadow Dragon Thaxll'ssillyia by group, namely:
- one character must turns into Mustard Jelly * (using the 'Polymorph Self' spell or Cloak of the Sewers item) and attacks the dragon in melee range;
- arcane casters of a group must cast 'Lower Resistance' spell (2 to 3 times) on a dragon**;
- everyone in group, who can cast 'Magic Missile' - must casts it on a dragon. Ususally 10 casts of max level 'Magic Missiles' should be enough.
PS Also, you can kill the black dragon Nizidramanii'yt almost by the same way, but you need to protect yours heroic 'jelly' from acid (spell or green scrolls).
PPS I left a similar comment on the wiki - as in that
article a lot of nonsense (namely about acid) is written.
* Mustard Jelly is immune to Level Drain, Blindness, Fear and piercing damage - all main attacks of the Thaxll'ssillyia. Use any healing potions to compensate a Wing Buffet damage.
**Before fight a LOW level (at 9-10 lvl) cleric may cast 'Magic Resistance' spell on a Shadow Dragon - its lowers both magic resistance of a dragon and numbers of usage of 'Lower Resistance' spell (to 1).