about dances...when you are in a party (without a recherger) you must be very crefull how you manage your mp

until 52 u must solo, after 52 (untill 58 ) nuker party will want you for having mystic dance and concentration dance.At 58 you get dance of fury and then you only have to write "!BD 58~~~ LFP !"

as for the dyes ; do NOT reduce CON, DE's have low hp and by reducin CON you won't get anything good

the equipment id not bad since doom => +3 con but you could also chose bw for +3 STR but that only depends on playstyle

for A grade get tallum heavy or mj heavy and dual kesh

Since we all agree a BD is a support char the dyes you propose are a bit not verry right . The armor choice is perfect doom heavy now u have +3 CON here. Next dyes lets keep the HP high, so + 5 CON - 5 DEX . So what do we have now a BD with 40 CON. Decent HP/CP, now the weapon Sword of nightmare*SLS . Actualy at low rate server the longer u can stand alive means the higher the chance of a kill is even in pvp, not only at low rate actualy

Dance of Medusa is not a paralyze skill (like anchor for example) but petrification skill. So it turns close targets into the stone with some probability. While under Dance of Medusa players are invulnerable to any damage, it is useless to hit them (but any DoT before the medusa still consumes CP/HP).
So Dance of Medusa works only as an elimination temporary of some enemies. So during pvp it is useful only if sting first lands.