case SPELL_STONEMAIL:                return TILEG_STONEMAIL

    case SPELL_WARP_BRAND:               return TILEG_WARP_WEAPON;

    case SPELL_SUMMON_UGLY_THING:        return TILEG_SUMMON_UGLY_THING;

    case SPELL_DEATHS_DOOR:              return TILEG_DEATHS_DOOR;

    // Spells still missing tiles:
    case SPELL_DEATHS_DOOR:
    case SPELL_SUMMON_UGLY_THING:
    case SPELL_WARP_BRAND:
        return TILEG_TODO;

    case SPELL_PARALYSE:
        return TILEG_PETRIFY; // similar effect

    case SPELL_PARALYSE:      // we could reuse Petrify for this

    case SPELL_STONEMAIL:     // Xom only?

static bool _sort_mem_spells(spell_type a, spell_type b)
{
    if (spell_fail(a) != spell_fail(b))
        return (spell_fail(a) < spell_fail(b));
    if (spell_difficulty(a) != spell_difficulty(b))
        return (spell_difficulty(a) < spell_difficulty(b));
    return (stricmp(spell_title(a), spell_title(b)) < 0);
}

    std::sort(mem_spells.begin(), mem_spells.end(), _sort_mem_spells);

static bool _sort_mem_spells(spell_type a, spell_type b)
{
    if (spell_fail(a) != spell_fail(b))
        return (spell_fail(a) < spell_fail(b));
    if (spell_difficulty(a) != spell_difficulty(b))
        return (spell_difficulty(a) < spell_difficulty(b));
    return (stricmp(spell_title(a), spell_title(b)) < 0);
}

Warp Brand
Death's Door
Summon Ugly Thing

portal projectile?
warp brand?
phase shift?

stonemail STONEMAIL

deaths_door DEATHS_DOOR

summon_ugly_thing SUMMON_UGLY_THING

warp_weapon WARP_WEAPON

The Lair is ten levels deep and contains the stairs to three more branches.

The Lair is eight levels deep and contains the stairs to three more branches.

* Shorten Lair to eight levels.

* Overhaul Wanderers.

* New memorisation interface.