[Diamond]

When Hus attacked the morality of Catholic priests and pressed for wider access to the scripture, he was not only accepted, but invited to the ecumenical synod of 1405.

I can't find an ecumenical council in 1405.

I'm not certain it is the same council to which you refer, but the source posted below at #14 by SoFloFreeper gives a very different picture:

In November 1414, the Council of Constance assembled, and Huss was urged by Holy Roman Emperor Sigismund to come and give an account of his doctrine. Because he was promised safe conduct, and because of the importance of the council (which promised significant church reforms), Huss went. When he arrived, however, he was immediately arrested, and he remained imprisoned for months. Instead of a hearing, Huss was eventually hauled before authorities in chains and asked merely to recant his views.

Cordially,

[dangus]

Not an ecumenical council. A mere synod. A biennial one, where he was encouraged to urge for the purification of the priesthood.